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The history of the United States, a country in North America, began with the settlement of Indigenous people before 15,000 BC. Numerous cultures formed. The arrival of Christopher Columbus in the year of 1492 started the European colonization of the Americas. Most colonies formed after 1600. By the 1760s, thirteen British colonies contained 2.5 million people along the Atlantic coast east of the Appalachian Mountains. After defeating France, the British government imposed a series of new taxes after 1765, rejecting the colonists' argument that new taxes needed their approval (see Stamp Act 1765). Tax resistance, especially the Boston Tea Party (1773), led to punitive laws by Parliament designed to end self-government in Massachusetts.
Armed conflict began in 1775. In 1776 in Philadelphia, the Second Continental Congress declared the independence of the colonies as the United States of America. Led by General George Washington, it won the Revolutionary War with large support from France. The peace treaty of 1783 gave the new nation the land east of the Mississippi River (except Canada and Florida). The Articles of Confederation established a central government, but it was ineffectual at providing stability, as it could not collect taxes and had no executive officer. A convention in 1787 wrote a new Constitution that was adopted in 1789. In 1791, a Bill of Rights was added to guarantee inalienable rights. With Washington as the first president and Alexander Hamilton his chief adviser, a strong central government was created. Purchase of the Louisiana Territory from France in 1803 doubled the size of the United States. A second and final war with Britain was fought in 1812, which solidified national pride.
Encouraged by the notion of manifest destiny, U.S. territory expanded all the way to the Pacific coast. While the United States was large in terms of area, its population in 1790 was only 4 million. However, it grew rapidly, reaching 7.2 million in 1810, 32 million in 1860, 76 million in 1900, 132 million in 1940, and 321 million in 2015. Economic growth in terms of overall GDP was even greater. However compared to European powers, the nation's military strength was relatively limited in peacetime before 1940. The expansion was driven by a quest for inexpensive land for yeoman farmers and slave owners. The expansion of slavery was increasingly controversial and fueled political and constitutional battles, which were resolved by compromises. Slavery was abolished in all states north of the Mason–Dixon line by 1804, but the South continued to profit from the institution, mostly from production of cotton. Republican Abraham Lincoln was elected in 1860 on a platform of halting the expansion of slavery.
Seven Southern slave states rebelled and created the foundation of the Confederacy. Its attack of Fort Sumter against the Union forces started the Civil War (1861–1865). Confederate defeat led to the impoverishment of the South and the abolition of slavery. In the Reconstruction Era (1863–1877), legal and voting rights were extended to freed slaves. The national government emerged much stronger, and because of the Fourteenth Amendment in 1868, it gained the explicit duty to protect individual rights. However, when white Democrats regained their power in the South in 1877, often by paramilitary suppression of voting, they passed Jim Crow laws to maintain white supremacy, and new disfranchising constitutions that prevented most African Americans and many poor whites from voting. This continued until gains of the Civil Rights Movement in the 1960s and passage of federal legislation to enforce constitutional rights were made.
The United States became the world's leading industrial power at the turn of the 20th century due to an outburst of entrepreneurship in the Northeast and Midwest and the arrival of millions of immigrant workers and farmers from Europe. The national railroad network was completed and large-scale mining and factories industrialized the Northeast and Midwest. Mass dissatisfaction with corruption, inefficiency and traditional politics stimulated the Progressive movement, from the 1890s to 1920s, which led to many reforms including the 16th to 19th constitutional amendments, which brought the federal income tax, direct election of Senators, prohibition, and women's suffrage. Initially neutral during World War I, the United States declared war on Germany in 1917 and funded the Allied victory the following year. Women obtained the right to vote in 1920, with Native Americans obtaining citizenship and the right to vote in 1924.
After a prosperous decade in the 1920s, the Wall Street Crash of 1929 marked the onset of the decade-long worldwide Great Depression. Democratic President Franklin D. Roosevelt ended the Republican dominance of the White House and implemented his New Deal programs, which included relief for the unemployed, support for farmers, Social Security and a minimum wage. The New Deal defined modern American liberalism. After the Japanese attack on Pearl Harbor in 1941, the United States entered World War II and financed the Allied war effort and helped defeat Nazi Germany in the European theater. Its involvement culminated in using newly invented nuclear weapons on two Japanese cities to defeat Imperial Japan in the Pacific theater.
The United States and the Soviet Union emerged as rival superpowers in the aftermath of World War II. During the Cold War, the two countries confronted each other indirectly in the arms race, the Space Race, proxy wars, and propaganda campaigns. The purpose of this was to stop the spread of communism. In the 1960s, in large part due to the strength of the Civil Rights Movement, another wave of social reforms was enacted by enforcing the constitutional rights of voting and freedom of movement to African-Americans and other racial minorities. The Cold War ended when the Soviet Union was officially dissolved in 1991, leaving the United States as the world's only superpower.
After the Cold War, the United States has been focusing on modern conflicts in the Middle East and nuclear programs in North Korea. The beginning of the 21st century saw the September 11 attacks by Al-Qaeda in 2001, which was followed by the wars in Afghanistan and Iraq. In 2008, the United States had its worst economic crisis since the Great Depression, which was followed by slower-than-usual rates of economic growth during the 2010s.
- 1 Pre-Columbian Era
- 2 Colonial period
- 3 18th century
- 4 American Revolution
- 5 Early years of the republic
6 19th century
- 6.1 Jeffersonian Republican Era
- 6.2 War of 1812
- 6.3 Era of Good Feelings
- 6.4 Indian removal
- 6.5 Second Party System
- 6.6 Second Great Awakening
- 6.7 Abolitionism
- 6.8 Westward expansion and Manifest Destiny
- 6.9 Divisions between North and South
- 6.10 Civil War
- 6.11 Emancipation
- 6.12 Reconstruction Era
- 6.13 The West and the Gilded Age
7 20th century
- 7.1 Progressive Era
- 7.2 Imperialism
- 7.3 World War I
- 7.4 Women's suffrage
- 7.5 Roaring Twenties
- 7.6 Great Depression and New Deal
- 7.7 World War II
- 7.8 The Cold War
- 7.9 Counterculture, and civil rights
- 7.10 Close of the 20th century
- 8 21st century
- 9 See also
- 10 References
- 11 Notes
- 12 Textbooks
- 13 Further reading
- 14 External links
It is not definitively known how or when the Native Americans first settled the Americas and the present-day United States. The prevailing theory proposes that people migrated from Eurasia across Beringia, a land bridge that connected Siberia to present-day Alaska during the Ice Age, and then spread southward throughout the Americas. This migration may have begun as early as 30,000 years ago  and continued through to about 10,000+ years ago, when the land bridge became submerged by the rising sea level caused by the ending of the last glacial period.  These early inhabitants, called Paleoamericans, soon diversified into many hundreds of culturally distinct nations and tribes.
The pre-Columbian era incorporates all period subdivisions in the history and prehistory of the Americas before the appearance of significant European influences on the American continents, spanning the time of the original settlement in the Upper Paleolithic period to European colonization during the early modern period. While technically referring to the era before Christopher Columbus' voyages of 1492 to 1504, in practice the term usually includes the history of American indigenous cultures until they were conquered or significantly influenced by Europeans, even if this happened decades or even centuries after Columbus' initial landing.
Native American cultures are not normally included in characterizations of advanced stone age cultures as " Neolithic," which is a category that more often includes only the cultures in Eurasia, Africa, and other regions. The archaeological periods used are the classifications of archaeological periods and cultures established in Gordon Willey and Philip Phillips' 1958 book Method and Theory in American Archaeology. They divided the archaeological record in the Americas into five phases;  see Archaeology of the Americas.
The Clovis culture, a megafauna hunting culture, is primarily identified by use of fluted spear points. Artifacts from this culture were first excavated in 1932 near Clovis, New Mexico. The Clovis culture ranged over much of North America and also appeared in South America. The culture is identified by the distinctive Clovis point, a flaked flint spear-point with a notched flute, by which it was inserted into a shaft. Dating of Clovis materials has been by association with animal bones and by the use of carbon dating methods. Recent reexaminations of Clovis materials using improved carbon-dating methods produced results of 11,050 and 10,800 radiocarbon years B.P. (roughly 9100 to 8850 BCE).
Numerous Paleoindian cultures occupied North America, with some arrayed around the Great Plains and Great Lakes of the modern United States of America and Canada, as well as adjacent areas to the West and Southwest. According to the oral histories of many of the indigenous peoples of the Americas, they have been living on this continent since their genesis, described by a wide range of traditional creation stories. Other tribes have stories that recount migrations across long tracts of land and a great river, believed to be the Mississippi River.  Genetic and linguistic data connect the indigenous people of this continent with ancient northeast Asians. Archeological and linguistic data has enabled scholars to discover some of the migrations within the Americas.
The Folsom Tradition was characterized by use of Folsom points as projectile tips, and activities known from kill sites, where slaughter and butchering of bison took place. Folsom tools were left behind between 9000 BCE and 8000 BCE. 
Na-Dené-speaking peoples entered North America starting around 8000 BCE, reaching the Pacific Northwest by 5000 BCE,  and from there migrating along the Pacific Coast and into the interior. Linguists, anthropologists and archeologists believe their ancestors comprised a separate migration into North America, later than the first Paleo-Indians. They migrated into Alaska and northern Canada, south along the Pacific Coast, into the interior of Canada, and south to the Great Plains and the American Southwest.
They were the earliest ancestors of the Athabascan- speaking peoples, including the present-day and historical Navajo and Apache. They constructed large multi-family dwellings in their villages, which were used seasonally. People did not live there year-round, but for the summer to hunt and fish, and to gather food supplies for the winter.  The Oshara Tradition people lived from 5500 BCE to 600 CE. They were part of the Southwestern Archaic Tradition centered in north-central New Mexico, the San Juan Basin, the Rio Grande Valley, southern Colorado, and southeastern Utah.
Since the 1990s, archeologists have explored and dated eleven Middle Archaic sites in present-day Louisiana and Florida at which early cultures built complexes with multiple earthwork mounds; they were societies of hunter-gatherers rather than the settled agriculturalists believed necessary according to the theory of Neolithic Revolution to sustain such large villages over long periods. The prime example is Watson Brake in northern Louisiana, whose 11-mound complex is dated to 3500 BCE, making it the oldest, dated site in the Americas for such complex construction. It is nearly 2,000 years older than the Poverty Point site. Construction of the mounds went on for 500 years until was abandoned about 2800 BCE, probably due to changing environmental conditions. 
Poverty Point culture is a Late Archaic archaeological culture that inhabited the area of the lower Mississippi Valley and surrounding Gulf Coast. The culture thrived from 2200 BCE to 700 BCE, during the Late Archaic period.  Evidence of this culture has been found at more than 100 sites, from the major complex at Poverty Point (a UNESCO World Heritage Site) across a 100-mile (160 km) range to the Jaketown Site near Belzoni, Mississippi.
Poverty Point is a 1 square mile (2.6 km2) complex of six major earthwork concentric rings, with additional platform mounds at the site. Artifacts show the people traded with other Native Americans located from Georgia to the Great Lakes region. This is one among numerous mound sites of complex indigenous cultures throughout the Mississippi and Ohio valleys. They were one of several succeeding cultures often referred to as mound builders.
The Woodland period of North American pre-Columbian cultures refers to the time period from roughly 1000 BCE to 1000 CE in the eastern part of North America. The term "Woodland" was coined in the 1930s and refers to prehistoric sites dated between the Archaic period and the Mississippian cultures. The Hopewell tradition is the term for the common aspects of the Native American culture that flourished along rivers in the northeastern and midwestern United States from 200 BCE to 500 CE. 
The Hopewell tradition was not a single culture or society, but a widely dispersed set of related populations, who were connected by a common network of trade routes,  known as the Hopewell Exchange System. At its greatest extent, the Hopewell exchange system ran from the Southeastern United States into the southeastern Canadian shores of Lake Ontario. Within this area, societies participated in a high degree of exchange; most activity was conducted along the waterways that served as their major transportation routes. The Hopewell exchange system traded materials from all over the United States.
The indigenous peoples of the Pacific Northwest Coast were of many nations and tribal affiliations, each with distinctive cultural and political identities, but they shared certain beliefs, traditions and practices, such as the centrality of salmon as a resource and spiritual symbol. Their gift-giving feast, potlatch, is a highly complex event where people gather in order to commemorate special events such as the raising of a Totem pole or the appointment or election of a new chief. The most famous artistic feature of the culture is the Totem pole, with carvings of animals and other characters to commemorate cultural beliefs, legends, and notable events.
- Adena culture: The Adena culture was a Native American culture that existed from 1000 BC to 200 BC, in a time known as the Early Woodland period. The Adena culture refers to what were probably a number of related Native American societies sharing a burial complex and ceremonial system.
- Coles Creek culture: The Coles Creek culture is an indigenous development of the Lower Mississippi Valley that took place between the terminal Woodland period and the later Plaquemine culture period. The period is marked by the increased use of flat-topped platform mounds arranged around central plazas, more complex political institutions, and a subsistence strategy still grounded in the Eastern Agricultural Complex and hunting rather than on the maize plant as would happen in the succeeding Plaquemine Mississippian period. The culture was originally defined by the unique decoration on grog-tempered ceramic ware by James A. Ford after his investigations at the Mazique Archeological Site. He had studied both the Mazique and Coles Creek Sites, and almost went with the Mazique culture, but decided on the less historically involved sites name. It is ancestral to the Plaquemine culture.
- Hohokam culture: The Hohokam was a culture centered along American Southwest.  The early Hohokam founded a series of small villages along the middle Gila River. They raised corn, squash and beans. The communities were located near good arable land, with dry farming common in the earlier years of this period.  They were known for their pottery, using the paddle-and-anvil technique. The Classical period of the culture saw the rise in architecture and ceramics. Buildings were grouped into walled compounds, as well as earthen platform mounds. Platform mounds were built along river as well as irrigation canal systems, suggesting these sites were administrative centers allocating water and coordinating canal labor. Polychrome pottery appeared, and inhumation burial replaced cremation. Trade included that of shells and other exotics. Social and climatic factors led to a decline and abandonment of the area after 1400 A.D.
Ancestral Puebloan culture: The Ancestral Puebloan culture covered present-day
Four Corners region of the United States, comprising southern
New Mexico, and southwestern
 It is believed that the Ancestral Puebloans developed, at least in part, from the
Oshara Tradition, who developed from the
Picosa culture. They lived in a range of structures that included small family pit houses, larger clan type structures, grand
pueblos, and cliff sited dwellings. The Ancestral Puebloans possessed a complex network that stretched across the
Colorado Plateau linking hundreds of communities and population centers. The culture is perhaps best known for the stone and earth dwellings built along cliff walls, particularly during the
Pueblo II and
Pueblo III eras.
- Three UNESCO World Heritage Sites located in the United States are credited to the Pueblos: Mesa Verde National Park, Chaco Culture National Historical Park and Taos Pueblo.
- The best-preserved examples of the stone dwellings are in National Parks, examples being, Navajo National Monument, Chaco Culture National Historical Park, Mesa Verde National Park, Canyons of the Ancients National Monument, Aztec Ruins National Monument, Bandelier National Monument, Hovenweep National Monument, and Canyon de Chelly National Monument.
Mississippian culture: The Mississippian culture which extended throughout the Ohio and Mississippi valleys and built sites throughout the Southeast, created the largest
earthworks in North America north of Mexico, most notably at
Cahokia, on a tributary of the Mississippi River in present-day Illinois.
- The ten-story Monks Mound at Cahokia has a larger circumference than the Pyramid of the Sun at Teotihuacan or the Great Pyramid of Egypt. The 6 square miles (16 km2) city complex was based on the culture's cosmology; it included more than 100 mounds, positioned to support their sophisticated knowledge of astronomy, and built with knowledge of varying soil types. The society began building at this site about 950 CE, and reached its peak population in 1,250 CE of 20,000–30,000 people, which was not equalled by any city in the present-day United States until after 1800.
- Cahokia was a major regional chiefdom, with trade and tributary chiefdoms located in a range of areas from bordering the Great Lakes to the Gulf of Mexico.
- Kincaid  c. 1050–1400 AD,  is one of the largest settlements of the Mississippian culture, it was located at the southern tip of present-day U.S. state of Illinois. Kincaid Mounds has been notable for both its significant role in native North American prehistory and for the central role the site has played in the development of modern archaeological techniques. The site had at least 11 substructure platform mounds (ranking fifth for mound-culture pyramids). Artifacts from the settlement link its major habitation and the construction of the mounds to the Mississippian period, but it was also occupied earlier during the Woodland period.
- The Mississippian culture developed the Southeastern Ceremonial Complex, the name which archeologists have given to the regional stylistic similarity of artifacts, iconography, ceremonies and mythology. The rise of the complex culture was based on the people's adoption of maize agriculture, development of greater population densities, and chiefdom-level complex social organization from 1200 CE to 1650 CE.  
- The Mississippian pottery are some of the finest and most widely spread ceramics north of Mexico. Cahokian pottery was especially fine, with smooth surfaces, very thin walls and distinctive tempering, slips and coloring. 
Iroquois Culture: The
Iroquois League of Nations or "People of the Long House", based in present-day upstate and western
New York, had a
confederacy model from the mid-15th century. It has been suggested that their culture contributed to political thinking during the development of the later United States government. Their system of affiliation was a kind of federation, different from the strong, centralized European monarchies.
- Leadership was restricted to a group of 50 sachem chiefs, each representing one clan within a tribe. The Oneida and Mohawk people had nine seats each; the Onondagas held fourteen; the Cayuga had ten seats; and the Seneca had eight. Representation was not based on population numbers, as the Seneca tribe greatly outnumbered the others. When a sachem chief died, his successor was chosen by the senior woman of his tribe in consultation with other female members of the clan; property and hereditary leadership were passed matrilineally. Decisions were not made through voting but through consensus decision making, with each sachem chief holding theoretical veto power. The Onondaga were the " firekeepers", responsible for raising topics to be discussed. They occupied one side of a three-sided fire (the Mohawk and Seneca sat on one side of the fire, the Oneida and Cayuga sat on the third side.) 
- Elizabeth Tooker, an anthropologist, has said that it was unlikely the U.S. founding fathers were inspired by the confederacy, as it bears little resemblance to the system of governance adopted in the United States. For example, it is based on inherited rather than elected leadership, selected by female members of the tribes, consensus decision-making regardless of population size of the tribes, and a single group capable of bringing matters before the legislative body. 
- Long-distance trading did not prevent warfare and displacement among the indigenous peoples, and their oral histories tell of numerous migrations to the historic territories where Europeans encountered them. The Iroquois invaded and attacked tribes in the Ohio River area of present-day Kentucky and claimed the hunting grounds. Historians have placed these events as occurring as early as the 13th century, or in the 17th-century Beaver Wars. 
- Through warfare, the Iroquois drove several tribes to migrate west to what became known as their historically traditional lands west of the Mississippi River. Tribes originating in the Ohio Valley who moved west included the Osage, Kaw, Ponca and Omaha people. By the mid-17th century, they had resettled in their historical lands in present-day Kansas, Nebraska, Arkansas and Oklahoma. The Osage warred with Caddo-speaking Native Americans, displacing them in turn by the mid-18th century and dominating their new historical territories. 
Native development in Hawaii begins with the settlement of Polynesians between the 1st and 10th centuries. Around 1200 AD Tahitian explorers found and began settling the area as well. This became the rise of the Hawaiian civilization and would be separated from the rest of the world for another 500 years until the arrival of the British. Europeans under the British explorer Captain James Cook arrived in the Hawaiian Islands in 1778. Within five years of contact, European military technology would help Kamehameha I conquer most of the people, and eventually unify the islands for the first time; establishing the Kingdom of Hawaii.
After a period of exploration sponsored by major European nations, the first successful English settlement was established in 1607. Europeans brought horses, cattle, and hogs to the Americas and, in turn, took back to Europe maize, turkeys, potatoes, tobacco, beans, and squash. Many explorers and early settlers died after being exposed to new diseases in the Americas. The effects of new Eurasian diseases carried by the colonists, especially smallpox and measles, were much worse for the Native Americans, as they had no immunity to them. They suffered epidemics and died in very large numbers, usually before large-scale European settlement began. Their societies were disrupted and hollowed out by the scale of deaths.  
Spanish explorers were the first Europeans with Christopher Columbus' second expedition, to reach Puerto Rico on November 19, 1493; others reached Florida in 1513.  Spanish expeditions quickly reached the Appalachian Mountains, the Mississippi River, the Grand Canyon  and the Great Plains. In 1540, Hernando de Soto undertook an extensive exploration of the Southeast. 
In 1540, Francisco Vásquez de Coronado explored from Arizona to central Kansas.  Small Spanish settlements eventually grew to become important cities, such as San Antonio, Texas; Albuquerque, New Mexico; Tucson, Arizona; Los Angeles, California; and San Francisco, California. 
New Netherland was a 17th-century Dutch colony centered on present-day New York City and the Hudson River Valley; the Dutch traded furs with the Native Americans to the north. The colony served as a barrier to expansion from New England. Despite being Calvinists and building the Reformed Church in America, the Dutch were tolerant of other religions and cultures. 
The colony, which was taken over by Britain in 1664, left an enduring legacy on American cultural and political life. This includes secular broad-mindedness and mercantile pragmatism in the city as well as rural traditionalism in the countryside (typified by the story of Rip Van Winkle). Notable Americans of Dutch descent include Martin Van Buren, Theodore Roosevelt, Franklin D. Roosevelt, Eleanor Roosevelt and the Frelinghuysens. 
New France was the area colonized by France from 1534 to 1763. There were few permanent settlers outside Quebec and Acadia, but the French had far-reaching trading relationships with Native Americans throughout the Great Lakes and Midwest. French villages along the Mississippi and Illinois rivers were based in farming communities that served as a granary for Gulf Coast settlements. The French established plantations in Louisiana along with settling New Orleans, Mobile and Biloxi.
The Wabanaki Confederacy were military allies of New France through the four French and Indian Wars while the British colonies were allied with the Iroquois Confederacy. During the French and Indian War – the North American theater of the Seven Years' War – New England fought successfully against French Acadia. The British removed Acadians from Acadia ( Nova Scotia) and replaced them with New England Planters.  Eventually, some Acadians resettled in Louisiana, where they developed a distinctive rural Cajun culture that still exists. They became American citizens in 1803 with the Louisiana Purchase.  Other French villages along the Mississippi and Illinois rivers were absorbed when the Americans started arriving after 1770, or settlers moved west to escape them.  French influence and language in New Orleans, Louisiana and the Gulf Coast was more enduring; New Orleans was notable for its large population of free people of color before the Civil War.
The strip of land along the eastern seacoast was settled primarily by English colonists in the 17th century along with much smaller numbers of Dutch and Swedes. Colonial America was defined by a severe labor shortage that employed forms of unfree labor such as slavery and indentured servitude and by a British policy of benign neglect ( salutary neglect). Over half of all European immigrants to Colonial America arrived as indentured servants.  Salutary neglect permitted the development of an American spirit distinct from that of its European founders. 
The first successful English colony, Jamestown, was established in 1607 on the James River in Virginia. Jamestown languished for decades until a new wave of settlers arrived in the late 17th century and established commercial agriculture based on tobacco. Between the late 1610s and the Revolution, the British shipped an estimated 50,000 to 120,000 convicts to their American colonies.  A severe instance of conflict was the 1622 Powhatan uprising in Virginia in which Native Americans killed hundreds of English settlers. The largest conflicts between Native Americans and English settlers in the 17th century were King Philip's War in New England  and the Yamasee War in South Carolina. 
New England was initially settled primarily by Puritans. The Pilgrims established a settlement in 1620 at Plymouth Colony, which was followed by the establishment of the Massachusetts Bay Colony in 1630. The Middle Colonies, consisting of the present-day states of New York, New Jersey, Pennsylvania, and Delaware, were characterized by a large degree of diversity. The first attempted English settlement south of Virginia was the Province of Carolina, with Georgia Colony – the last of the Thirteen Colonies – established in 1733. 
The colonies were characterized by people primarily of the Judeo-Christian faiths, with many Congregationalists in New England, German and Dutch Reformed in the Middle Colonies, Catholics in Maryland, and Scots-Irish Presbyterians on the frontier. Sephardic Jews were among early settlers in cities of New England and the South. Many immigrants arrived as religious refugees: French Huguenots settled in New York, Virginia and the Carolinas. Many royal officials and merchants were Anglicans. 
Religiosity expanded greatly after the First Great Awakening, a religious revival in the 1740s led by preachers such as Jonathan Edwards and George Whitefield. American Evangelicals affected by the Awakening added a new emphasis on divine outpourings of the Holy Spirit and conversions that implanted within new believers an intense love for God. Revivals encapsulated those hallmarks and carried the newly created evangelicalism into the early republic, setting the stage for the Second Great Awakening beginning in the late 1790s.  In the early stages, evangelicals in the South such as Methodists and Baptists preached for religious freedom and abolition of slavery; they converted many slaves and recognized some as preachers.
Each of the 13 American colonies had a slightly different governmental structure. Typically, a colony was ruled by a governor appointed from London who controlled the executive administration and relied upon a locally elected legislature to vote taxes and make laws. By the 18th century, the American colonies were growing very rapidly as a result of low death rates along with ample supplies of land and food. The colonies were richer than most parts of Britain, and attracted a steady flow of immigrants, especially teenagers who arrived as indentured servants. 
The tobacco and rice plantations imported African slaves for labor from the British colonies in the West Indies, and by the 1770s African slaves comprised a fifth of the American population. The question of independence from Britain did not arise as long as the colonies needed British military support against the French and Spanish powers. Those threats were gone by 1765. London regarded the American colonies as existing for the benefit of the mother country. This policy is known as mercantilism. 
An upper-class, with wealth based on large plantations operated by slave labor, and holding significant political power and even control over the churches, emerged in South Carolina and Virginia. A unique class system operated in upstate New York, where Dutch tenant farmers rented land from very wealthy Dutch proprietors, such as the Rensselaer family. The other colonies were more equalitarian, with Pennsylvania being representative. By the mid-18th century Pennsylvania was basically a middle-class colony with limited deference to its small upper-class. A writer in the Pennsylvania Journal in 1756 summed it up:
The People of this Province are generally of the middling Sort, and at present pretty much upon a Level. They are chiefly industrious Farmers, Artificers or Men in Trade; they enjoy in are fond of Freedom, and the meanest among them thinks he has a right to Civility from the greatest. 
The French and Indian War (1754–63) was a watershed event in the political development of the colonies. It was also part of the larger Seven Years' War. The influence of the main rivals of the British Crown in the colonies and Canada, the French and North American Indians, was significantly reduced with the territory of the Thirteen Colonies expanding into New France both in Canada and the Louisiana Territory. Moreover, the war effort resulted in greater political integration of the colonies, as reflected in the Albany Congress and symbolized by Benjamin Franklin's call for the colonies to " Join or Die". Franklin was a man of many inventions – one of which was the concept of a United States of America, which emerged after 1765 and was realized in July 1776. 
Following Britain's acquisition of French territory in North America, King George III issued the Royal Proclamation of 1763 with the goal of organizing the new North American empire and protecting the native Indians from colonial expansion into western lands beyond the Appalachian Mountains. In ensuing years, strains developed in the relations between the colonists and the Crown. The British Parliament passed the Stamp Act of 1765, imposing a tax on the colonies without going through the colonial legislatures. The issue was drawn: did Parliament have this right to tax Americans who were not represented in it? Crying " No taxation without representation", the colonists refused to pay the taxes as tensions escalated in the late 1760s and early 1770s. 
The Boston Tea Party in 1773 was a direct action by activists in the town of Boston to protest against the new tax on tea. Parliament quickly responded the next year with the Coercive Acts, stripping Massachusetts of its historic right of self-government and putting it under army rule, which sparked outrage and resistance in all thirteen colonies. Patriot leaders from all 13 colonies convened the First Continental Congress to coordinate their resistance to the Coercive Acts. The Congress called for a boycott of British trade, published a list of rights and grievances, and petitioned the king for redress of those grievances.  The appeal to the Crown had no effect, and so the Second Continental Congress was convened in 1775 to organize the defense of the colonies against the British Army.
Ordinary folk became insurgents against the British even though they were unfamiliar with the ideological rationales being offered. They held very strongly a sense of "rights" that they felt the British were deliberately violating – rights that stressed local autonomy, fair dealing, and government by consent. They were highly sensitive to the issue of tyranny, which they saw manifested in the arrival in Boston of the British Army to punish the Bostonians. This heightened their sense of violated rights, leading to rage and demands for revenge. They had faith that God was on their side. 
The American Revolutionary War began at Concord and Lexington in April 1775 when the British tried to seize ammunition supplies and arrest the Patriot leaders.
In terms of political values, the Americans were largely united on a concept called Republicanism, that rejected aristocracy and emphasized civic duty and a fear of corruption. For the Founding Fathers, according to one team of historians, "republicanism represented more than a particular form of government. It was a way of life, a core ideology, an uncompromising commitment to liberty, and a total rejection of aristocracy." 
The Thirteen Colonies began a rebellion against British rule in 1775 and proclaimed their independence in 1776 as the United States of America. In the American Revolutionary War (1775–83) the Americans captured the British invasion army at Saratoga in 1777, secured the Northeast and encouraged the French to make a military alliance with the United States. France brought in Spain and the Netherlands, thus balancing the military and naval forces on each side as Britain had no allies. 
General George Washington (1732–99) proved an excellent organizer and administrator who worked successfully with Congress and the state governors, selecting and mentoring his senior officers, supporting and training his troops, and maintaining an idealistic Republican Army. His biggest challenge was logistics, since neither Congress nor the states had the funding to provide adequately for the equipment, munitions, clothing, paychecks, or even the food supply of the soldiers.
As a battlefield tactician, Washington was often outmaneuvered by his British counterparts. As a strategist, however, he had a better idea of how to win the war than they did. The British sent four invasion armies. Washington's strategy forced the first army out of Boston in 1776, and was responsible for the surrender of the second and third armies at Saratoga (1777) and Yorktown (1781). He limited the British control to New York City and a few places while keeping Patriot control of the great majority of the population. 
The Loyalists, whom the British counted upon too heavily, comprised about 20% of the population but never were well organized. As the war ended, Washington watched proudly as the final British army quietly sailed out of New York City in November 1783, taking the Loyalist leadership with them. Washington astonished the world when, instead of seizing power for himself, he retired quietly to his farm in Virginia.  Political scientist Seymour Martin Lipset observes, "The United States was the first major colony successfully to revolt against colonial rule. In this sense, it was the first 'new nation'." 
That these United Colonies are, and of right out to be, free and independent States, that they are absolved from all allegiance to the British Crown, and that all political connection between them and the State of Great Britain is, and ought to be, totally dissolved; that measures should be immediately taken for procuring the assistance of foreign powers, and a Confederation be formed to bind the colonies more closely together.
On July 4, 1776 they adopted the Declaration of Independence and this date is celebrated as the nation's birthday. Historian George Billias says:
Independence amounted to a new status of interdependence: the United States was now a sovereign nation entitled to the privileges and responsibilities that came with that status. America thus became a member of the international community, which meant becoming a maker of treaties and alliances, a military ally in diplomacy, and a partner in foreign trade on a more equal basis. 
On September 9, 1776, Congress officially changed the nation's name to the United States of America. Until this point, the nation was known as the "United Colonies of America" 
The new nation was founded on Enlightenment ideals of liberalism in what Thomas Jefferson called the unalienable rights to "life, liberty and the pursuit of happiness", and dedicated strongly to republican principles. Republicanism emphasized the people are sovereign (not hereditary kings), demanded civic duty, feared corruption, and rejected any aristocracy. 
In the 1780s the national government was able to settle the issue of the western territories, which were ceded by the states to Congress and became territories. With the migration of settlers to the Northwest, soon they became states. Nationalists worried that the new nation was too fragile to withstand an international war, or even internal revolts such as the Shays' Rebellion of 1786 in Massachusetts. 
Nationalists – most of them war veterans – organized in every state and convinced Congress to call the Philadelphia Convention in 1787. The delegates from every state wrote a new Constitution that created a much more powerful and efficient central government, one with a strong president, and powers of taxation. The new government reflected the prevailing republican ideals of guarantees of individual liberty and of constraining the power of government through a system of separation of powers. 
The Congress was given authority to ban the international slave trade after 20 years (which it did in 1807). A compromise gave the South Congressional apportionment out of proportion to its free population by allowing it to include three-fifths of the number of slaves in each state's total population. This provision increased the political power of southern representatives in Congress, especially as slavery was extended into the Deep South through removal of Native Americans and transportation of slaves by an extensive domestic trade.
To assuage the Anti-Federalists who feared a too-powerful national government, the nation adopted the United States Bill of Rights in 1791. Comprising the first ten amendments of the Constitution, it guaranteed individual liberties such as freedom of speech and religious practice, jury trials, and stated that citizens and states had reserved rights (which were not specified). 
George Washington – a renowned hero of the American Revolutionary War, commander-in-chief of the Continental Army, and president of the Constitutional Convention – became the first President of the United States under the new Constitution in 1789. The national capital moved from New York to Philadelphia in 1790 and finally settled in Washington DC in 1800.
The major accomplishments of the Washington Administration were creating a strong national government that was recognized without question by all Americans.  His government, following the vigorous leadership of Treasury Secretary Alexander Hamilton, assumed the debts of the states (the debt holders received federal bonds), created the Bank of the United States to stabilize the financial system, and set up a uniform system of tariffs (taxes on imports) and other taxes to pay off the debt and provide a financial infrastructure. To support his programs Hamilton created a new political party – the first in the world based on voters – the Federalist Party.
Thomas Jefferson and James Madison formed an opposition Republican Party (usually called the Democratic-Republican Party by political scientists). Hamilton and Washington presented the country in 1794 with the Jay Treaty that reestablished good relations with Britain. The Jeffersonians vehemently protested, and the voters aligned behind one party or the other, thus setting up the First Party System.
Federalists promoted business, financial and commercial interests and wanted more trade with Britain. Republicans accused the Federalists of plans to establish a monarchy, turn the rich into a ruling class, and making the United States a pawn of the British.  The treaty passed, but politics became intensely heated. 
The Whiskey Rebellion in 1794, when western settlers protested against a federal tax on liquor, was the first serious test of the federal government. Washington called out the state militia and personally led an army, as the insurgents melted away and the power of the national government was firmly established. 
Washington refused to serve more than two terms – setting a precedent – and in his famous farewell address, he extolled the benefits of federal government and importance of ethics and morality while warning against foreign alliances and the formation of political parties. 
John Adams, a Federalist, defeated Jefferson in the 1796 election. War loomed with France and the Federalists used the opportunity to try to silence the Republicans with the Alien and Sedition Acts, build up a large army with Hamilton at the head, and prepare for a French invasion. However, the Federalists became divided after Adams sent a successful peace mission to France that ended the Quasi-War of 1798.  
During the first two decades after the Revolutionary War, there were dramatic changes in the status of slavery among the states and an increase in the number of freed blacks. Inspired by revolutionary ideals of the equality of men and influenced by their lesser economic reliance on slavery, northern states abolished slavery.
States of the Upper South made manumission easier, resulting in an increase in the proportion of free blacks in the Upper South (as a percentage of the total non-white population) from less than one percent in 1792 to more than 10 percent by 1810. By that date, a total of 13.5 percent of all blacks in the United States were free.  After that date, with the demand for slaves on the rise because of the Deep South's expanding cotton cultivation, the number of manumissions declined sharply; and an internal U.S. slave trade became an important source of wealth for many planters and traders.
Jefferson, a scientist himself, supported expeditions to explore and map the new domain, most notably the Lewis and Clark Expedition.  Jefferson believed deeply in republicanism and argued it should be based on the independent yeoman farmer and planter; he distrusted cities, factories and banks. He also distrusted the federal government and judges, and tried to weaken the judiciary. However he met his match in John Marshall, a Federalist from Virginia. Although the Constitution specified a Supreme Court, its functions were vague until Marshall, the Chief Justice (1801–35), defined them, especially the power to overturn acts of Congress or states that violated the Constitution, first enunciated in 1803 in Marbury v. Madison. 
Thomas Jefferson defeated Adams for the presidency in the 1800 election. Americans were increasingly angry at the British violation of American ships' neutral rights in order to hurt France, the impressment (seizure) of 10,000 American sailors needed by the Royal Navy to fight Napoleon, and British support for hostile Indians attacking American settlers in the Midwest. They may also have desired to annex all or part of British North America.      Despite strong opposition from the Northeast, especially from Federalists who did not want to disrupt trade with Britain, Congress declared war on June 18, 1812. 
The war was frustrating for both sides. Both sides tried to invade the other and were repulsed. The American high command remained incompetent until the last year. The American militia proved ineffective because the soldiers were reluctant to leave home and efforts to invade Canada repeatedly failed. The British blockade ruined American commerce, bankrupted the Treasury, and further angered New Englanders, who smuggled supplies to Britain. The Americans under General William Henry Harrison finally gained naval control of Lake Erie and defeated the Indians under Tecumseh in Canada,  while Andrew Jackson ended the Indian threat in the Southeast. The Indian threat to expansion into the Midwest was permanently ended. The British invaded and occupied much of Maine.
The British raided and burned Washington, but were repelled at Baltimore in 1814 – where the "Star Spangled Banner" was written to celebrate the American success. In upstate New York a major British invasion of New York State was turned back. Finally in early 1815 Andrew Jackson decisively defeated a major British invasion at the Battle of New Orleans, making him the most famous war hero. 
With Napoleon (apparently) gone, the causes of the war had evaporated and both sides agreed to a peace that left the prewar boundaries intact. Americans claimed victory on February 18, 1815 as news came almost simultaneously of Jackson's victory of New Orleans and the peace treaty that left the prewar boundaries in place. Americans swelled with pride at success in the "second war of independence"; the naysayers of the antiwar Federalist Party were put to shame and the party never recovered. The Indians were the big losers; they never gained the independent nationhood Britain had promised and no longer posed a serious threat as settlers poured into the Midwest. 
As strong opponents of the war, the Federalists held the Hartford Convention in 1814 that hinted at disunion. National euphoria after the victory at New Orleans ruined the prestige of the Federalists and they no longer played a significant role as a political party.  President Madison and most Republicans realized they were foolish to let the Bank of the United States close down, for its absence greatly hindered the financing of the war. So, with the assistance of foreign bankers, they chartered the Second Bank of the United States in 1816.  
The Republicans also imposed tariffs designed to protect the infant industries that had been created when Britain was blockading the U.S. With the collapse of the Federalists as a party, the adoption of many Federalist principles by the Republicans, and the systematic policy of President James Monroe in his two terms (1817–25) to downplay partisanship, the nation entered an Era of Good Feelings, with far less partisanship than before (or after), and closed out the First Party System.  
The Monroe Doctrine, expressed in 1823, proclaimed the United States' opinion that European powers should no longer colonize or interfere in the Americas. This was a defining moment in the foreign policy of the United States. The Monroe Doctrine was adopted in response to American and British fears over Russian and French expansion into the Western Hemisphere. 
In 1832, President Andrew Jackson, 7th President of the United States, ran for a second term under the slogan "Jackson and no bank" and did not renew the charter of the Second Bank of the United States of America, ending the Bank in 1836.  Jackson was convinced that central banking was used by the elite to take advantage of the average American, and instead implemented state banks, popularly known as "pet banks". 
In 1830, Congress passed the Indian Removal Act, which authorized the president to negotiate treaties that exchanged Native American tribal lands in the eastern states for lands west of the Mississippi River.  Its goal was primarily to remove Native Americans, including the Five Civilized Tribes, from the American Southeast; they occupied land that settlers wanted. Jacksonian Democrats demanded the forcible removal of native populations who refused to acknowledge state laws to reservations in the West; Whigs and religious leaders opposed the move as inhumane. Thousands of deaths resulted from the relocations, as seen in the Cherokee Trail of Tears.  The Trail of Tears resulted in approximately 2,000–8,000 of the 16,543 relocated Cherokee perished along the way.   Many of the Seminole Indians in Florida refused to move west; they fought the Army for years in the Seminole Wars.
After the First Party System of Federalists and Republicans withered away in the 1820s, the stage was set for the emergence of a new party system based on well organized local parties that appealed for the votes of (almost) all adult white men. The former Jeffersonian (Democratic-Republican) party split into factions. They split over the choice of a successor to President James Monroe, and the party faction that supported many of the old Jeffersonian principles, led by Andrew Jackson and Martin Van Buren, became the Democratic Party. As Norton explains the transformation in 1828:
Jacksonians believed the people's will had finally prevailed. Through a lavishly financed coalition of state parties, political leaders, and newspaper editors, a popular movement had elected the president. The Democrats became the nation's first well-organized national party...and tight party organization became the hallmark of nineteenth-century American politics. 
Opposing factions led by Henry Clay helped form the Whig Party. The Democratic Party had a small but decisive advantage over the Whigs until the 1850s, when the Whigs fell apart over the issue of slavery.
Behind the platforms issued by state and national parties stood a widely shared political outlook that characterized the Democrats:
The Democrats represented a wide range of views but shared a fundamental commitment to the Jeffersonian concept of an agrarian society. They viewed the central government as the enemy of individual liberty. The 1824 "corrupt bargain" had strengthened their suspicion of Washington politics. ... Jacksonians feared the concentration of economic and political power. They believed that government intervention in the economy benefited special-interest groups and created corporate monopolies that favored the rich. They sought to restore the independence of the individual (the "common man," i.e. the artisan and the ordinary farmer) by ending federal support of banks and corporations and restricting the use of paper currency, which they distrusted. Their definition of the proper role of government tended to be negative, and Jackson's political power was largely expressed in negative acts. He exercised the veto more than all previous presidents combined. Jackson and his supporters also opposed reform as a movement. Reformers eager to turn their programs into legislation called for a more active government. But Democrats tended to oppose programs like educational reform mid the establishment of a public education system. They believed, for instance, that public schools restricted individual liberty by interfering with parental responsibility and undermined freedom of religion by replacing church schools. Nor did Jackson share reformers' humanitarian concerns. He had no sympathy for American Indians, initiating the removal of the Cherokees along the Trail of Tears.  
The Second Great Awakening was a Protestant revival movement that affected the entire nation during the early 19th century and led to rapid church growth. The movement began around 1790, gained momentum by 1800, and, after 1820 membership rose rapidly among Baptist and Methodist congregations, whose preachers led the movement. It was past its peak by the 1840s. 
It enrolled millions of new members in existing evangelical denominations and led to the formation of new denominations. Many converts believed that the Awakening heralded a new millennial age. The Second Great Awakening stimulated the establishment of many reform movements – including abolitionism and temperance designed to remove the evils of society before the anticipated Second Coming of Jesus Christ. 
After 1840 the abolitionist movement redefined itself as a crusade against the sin of slave ownership. It mobilized support (especially among religious women in the Northeast affected by the Second Great Awakening). William Lloyd Garrison, a radical abolitionist, published the most influential of the many anti-slavery newspapers, The Liberator, while Frederick Douglass, an ex-slave, began writing for that newspaper around 1840 and started his own abolitionist newspaper North Star in 1847.  The great majority of anti-slavery activists, such as Abraham Lincoln, rejected Garrison's theology and held that slavery was an unfortunate social evil, not a sin.  
The American colonies and the new nation grew rapidly in population and area, as pioneers pushed the frontier of settlement west.  The process finally ended around 1890–1912 as the last major farmlands and ranch lands were settled. Native American tribes in some places resisted militarily, but they were overwhelmed by settlers and the army and after 1830 were relocated to reservations in the west. The highly influential " Frontier Thesis" of Wisconsin historian Frederick Jackson Turner argues that the frontier shaped the national character, with its boldness, violence, innovation, individualism, and democracy. 
Recent historians have emphasized the multicultural nature of the frontier. Enormous popular attention in the media focuses on the "Wild West" of the second half of the 19th century. As defined by Hine and Faragher, "frontier history tells the story of the creation and defense of communities, the use of the land, the development of markets, and the formation of states". They explain, "It is a tale of conquest, but also one of survival, persistence, and the merging of peoples and cultures that gave birth and continuing life to America."  The first settlers in the west were the Spanish in New Mexico; they became U.S. citizens in 1848. The Hispanics in California (" Californios") were overwhelmed by over 100,000 gold rush miners. California grew explosively. San Francisco by 1880 had become the economic hub of the entire Pacific Coast with a diverse population of a quarter million.
From the early 1830s to 1869, the Oregon Trail and its many offshoots were used by over 300,000 settlers. '49ers (in the California Gold Rush), ranchers, farmers, and entrepreneurs and their families headed to California, Oregon, and other points in the far west. Wagon-trains took five or six months on foot; after 1869, the trip took 6 days by rail. 
Manifest Destiny was the belief that American settlers were destined to expand across the continent. This concept was born out of "A sense of mission to redeem the Old World by high example ... generated by the potentialities of a new earth for building a new heaven".  Manifest Destiny was rejected by modernizers, especially the Whigs like Henry Clay and Abraham Lincoln who wanted to build cities and factories – not more farms.  Democrats strongly favored expansion, and won the key election of 1844. After a bitter debate in Congress the Republic of Texas was annexed in 1845, leading to war with Mexico, who considered Texas to be a part of Mexico due to the large numbers of Mexican settlers. 
The Mexican–American War (1846–48) broke out with the Whigs opposed to the war, and the Democrats supporting the war. The U.S. army, using regulars and large numbers of volunteers, defeated the Mexican armies, invaded at several points, captured Mexico City and won decisively. The Treaty of Guadalupe Hidalgo ended the war in 1848. Many Democrats wanted to annex all of Mexico, but that idea was rejected by southerners who argued that by incorporating millions of Mexican people, mainly of mixed race, would undermine the United States as an exclusively white republic.  Instead the U.S. took Texas and the lightly settled northern parts (California and New Mexico). The Hispanic residents were given full citizenship and the Mexican Indians became American Indians. Simultaneously, gold was discovered in California in 1849, attracting over 100,000 men to northern California in a matter of months in the California Gold Rush. A peaceful compromise with Britain gave the U.S. ownership of the Oregon Country, which was renamed the Oregon Territory. 
The central issue after 1848 was the expansion of slavery, pitting the anti-slavery elements in the North, against the pro-slavery elements that dominated the South. A small number of active Northerners were abolitionists who declared that ownership of slaves was a sin (in terms of Protestant theology) and demanded its immediate abolition. Much larger numbers in the North were against the expansion of slavery, seeking to put it on the path to extinction so that America would be committed to free land (as in low-cost farms owned and cultivated by a family), free labor, and free speech (as opposed to censorship of abolitionist material in the South). Southern whites insisted that slavery was of economic, social, and cultural benefit to all whites (and even to the slaves themselves), and denounced all anti-slavery spokesmen as "abolitionists".  Justifications of slavery included economics, history, religion, legality, social good, and even humanitarianism, to further their arguments. Defenders of slavery argued that the sudden end to the slave economy would have had a profound and killing economic impact in the South where reliance on slave labor was the foundation of their economy. They also argued that if all the slaves were freed, there would be widespread unemployment and chaos. 
Religious activists split on slavery, with the Methodists and Baptists dividing into northern and southern denominations. In the North, the Methodists, Congregationalists, and Quakers included many abolitionists, especially among women activists. (The Catholic, Episcopal and Lutheran denominations largely ignored the slavery issue.) 
The issue of slavery in the new territories was seemingly settled by the Compromise of 1850, brokered by Whig Henry Clay and Democrat Stephen Douglas; the Compromise included the admission of California as a free state in exchange for no federal restrictions on slavery placed on Utah or New Mexico.  The point of contention was the Fugitive Slave Act, which increased federal enforcement and required even free states to cooperate in turning over fugitive slaves to their owners. Abolitionists pounced on the Act to attack slavery, as in the best-selling anti-slavery novel Uncle Tom's Cabin by Harriet Beecher Stowe. 
The Compromise of 1820 was repealed in 1854 with the Kansas–Nebraska Act, promoted by Senator Douglas in the name of " popular sovereignty" and democracy. It permitted voters to decide on the legality slavery in each territory, and allowed Douglas to adopt neutrality on the issue of slavery. Anti-slavery forces rose in anger and alarm, forming the new Republican Party. Pro- and anti- contingents rushed to Kansas to vote slavery up or down, resulting in a miniature civil war called Bleeding Kansas. By the late 1850s, the young Republican Party dominated nearly all northern states and thus the electoral college. It insisted that slavery would never be allowed to expand (and thus would slowly die out). 
The Southern slavery-based societies had become wealthy based on their cotton and other agricultural commodity production, and some particularly profited from the internal slave trade. Northern cities such as Boston and New York, and regional industries, were tied economically to slavery by banking, shipping, and manufacturing, including textile mills. By 1860, there were four million slaves in the South, nearly eight times as many as there were nationwide in 1790. The plantations were highly profitable, due to the heavy European demand for raw cotton. Most of the profits were invested in new lands and in purchasing more slaves (largely drawn from the declining tobacco regions).
For 50 of the nation's first 72 years, a slaveholder served as President of the United States and, during that period, only slaveholding presidents were re-elected to second terms.  In addition, southern states benefited by their increased apportionment in Congress due to the partial counting of slaves in their populations.
Slave rebellions, by Gabriel Prosser (1800), Denmark Vesey (1822), Nat Turner (1831), and most famously by John Brown (1859), caused fear in the white South, which imposed stricter oversight of slaves and reduced the rights of free blacks. The Fugitive Slave Act of 1850 required the states to cooperate with slave owners when attempting to recover escaped slaves, which outraged Northerners. Formerly, an escaped slave that reached a non-slave state was presumed to have attained sanctuary and freedom under the Missouri Compromise. The Supreme Court's 1857 decision in Dred Scott v. Sandford ruled that the Missouri Compromise was unconstitutional; angry Republicans said this decision threatened to make slavery a national institution.
After Abraham Lincoln won the 1860 election, seven Southern states seceded from the union and set up a new nation, the Confederate States of America (Confederacy), on February 8, 1861. It attacked Fort Sumter, a U.S. Army fort in South Carolina, thus igniting the war. When Lincoln called for troops to suppress the Confederacy in April 1861, four more states seceded and joined the Confederacy. A few of the (northernmost) " slave states" did not secede and became known as the border states; these were Delaware, Maryland, Kentucky, and Missouri.
The Civil War began on April 12, 1861, when elements of 100,000 Confederate forces attacked a U.S. military installation at Fort Sumter in South Carolina. In response to the attack, on April 15, Lincoln called on the states to send detachments totaling 75,000 troops to recapture forts, protect the capital, and "preserve the Union", which in his view still existed intact despite the actions of the seceding states. The two armies had their first major clash at the First Battle of Bull Run (Battle of Manassas), ending in a Union defeat, but, more importantly, proved to both the Union and Confederacy that the war would be much longer and bloodier than originally anticipated. 
The war soon divided into two theaters: Eastern and Western. In the western theater, the Union was relatively successful, with major battles, such as Perryville and Shiloh along with Union gunboat dominance of navigable rivers producing strategic Union victories and destroying major Confederate operations. 
Warfare in the Eastern theater began poorly for the Union as the Confederates won at Manassas Junction (Bull Run), just outside Washington. Major General George B. McClellan was put in charge of the Union armies. After reorganizing the new Army of the Potomac, McClellan failed to capture the Confederate capital of Richmond, Virginia in his Peninsula Campaign and retreated after attacks from newly appointed Confederate General Robert E. Lee.  Meanwhile, both sides concentrated in 1861–62 on raising and training new armies. The main action was Union success in controlling the border states, with Confederates largely driven out of Maryland, West Virginia (a new state), Kentucky and Missouri. The autumn 1862 Confederate campaign into Maryland was designed to hurt Union morale and win European support. It ended with Confederate retreat at the Battle of Antietam, and Lincoln's warning he would issue an Emancipation Proclamation in January 1863 if the states did not return. Making slavery a central war goal Energized Republicans in the North, as well as their enemies, the anti-war Copperhead Democrats. It ended the risk of British and French intervention.
Lee's smaller army won at the Battle of Fredericksburg late in 1862, causing yet another change in commanders. Lee won again at the Battle of Chancellorsville in May 1863, while losing his top aide, Stonewall Jackson. But Lee pushed too hard and ignored the Union threat in the west. Lee invaded Pennsylvania in search of supplies and to cause war-weariness in the North. In perhaps the turning point of the war, Lee's army was badly beaten at the Battle of Gettysburg, July 1–3, 1863, and barely made it back to Virginia.  On the homefront, industrial expansion in the North expanded dramatically, using its extensive railroad service, and moving industrial workers into munitions factories. Foreign trade increased, with the United States providing both food and cotton to Britain, And Britain sending in manufactured products and thousands of volunteers for the Union Army (plus a few to the Confederates). The British operated blockade runners bringing in food, luxury items and munitions to the Confederacy, bringing out tobacco and cotton. The Union blockade increasingly shut down Confederate ports, and by late 1864 the blockade runners Were usually captured before they could make more than handful of runs.
In the West, on July 4, 1863, Union forces under the command of General Ulysses S. Grant gained control of the Mississippi River at the Battle of Vicksburg, thereby splitting the Confederacy. Lincoln made General Grant commander of all Union armies. Grant put General William Tecumseh Sherman in charge of the Western armies. In 1864, Sherman marched south from Chattanooga to capture Atlanta, a decisive victory that ended war jitters among Republicans in the North who feared they might fail to reelect Lincoln in 1864. Lincoln won a landslide. The last two years of the war were bloody for both sides, With Sherman marching almost unopposed through central and eastern Georgia, then moving up through South Carolina and North Carolina, burning cities, destroying plantations, ruining railroads and bridges, but avoiding civilian casualties. Sherman demonstrated that the South lacked the long-term ability to resist a northern invasion. Much of the heartland of the Confederacy was physically destroyed, and could no longer provide desperately needed food, horses, mules, wagons, boots or munitions to its combat armies. In spring 1864 Grant, realizing that Lee was unable to replenishes casualties, while Lincoln would provide replacements for Union losses, launched a war of attrition against Lee's Army of Northern Virginia. This war of attrition was divided into three main campaigns. The first of these, the Overland Campaign forced Lee to retreat into the city of Petersburg where Grant launched his second major offensive, the Richmond-Petersburg Campaign in which he besieged Petersburg. After a near ten-month siege, Petersburg surrendered. However, the defense of Fort Gregg allowed Lee to move his army out of Petersburg. Grant pursued and launched the final, Appomattox Campaign which resulted in Lee surrendering his Army of Northern Virginia numbering 28,000 on April 9, 1865, at Appomattox Court House. Other Confederate armies followed suit and the war ended with no postwar insurgency.
The American Civil War was the world's earliest industrial war. Railroads, the telegraph, steamships, and mass-produced weapons were employed extensively. The mobilization of civilian factories, mines, shipyards, banks, transportation and food supplies all foreshadowed the impact of industrialization in World War I. It remains the deadliest war in American history, resulting in the deaths of about 750,000 soldiers and an undetermined number of civilian casualties.  About ten percent of all Northern males 20–45 years old, and 30 percent of all Southern white males aged 18–40 died.  Its legacy includes ending slavery in the United States, restoring the Union, and strengthening the role of the federal government.
According to historian Allan Nevins the Civil War had a major long-term impact on the United States in terms of developing its leadership potential and moving the entire nation beyond the adolescent stage:
- The fighting and its attendant demands upon industry, finance, medicine, and law also helped train a host of leaders who during the next 35 years, to 1900, made their influence powerfully felt on most of the social, economic, and cultural fronts. It broke down barriers of parochialism; it ended distrust of large-scale effort; it hardened and matured the whole people emotionally. The adolescent land of the 1850s…rose under the blows of battle to adult estate. The nation of the post-Appomattox generation, though sadly hurt (especially in the South) by war losses, and deeply scarred psychologically (especially in the North) by war hatreds and greeds, had at last the power, resolution, and self-trust of manhood. 
The Emancipation Proclamation was an executive order issued by President Abraham Lincoln on January 1, 1863. In a single stroke it changed the legal status, as recognized by the U.S. government, of 3 million slaves in designated areas of the Confederacy from "slave" to "free". It had the practical effect that as soon as a slave escaped the control of the Confederate government, by running away or through advances of federal troops, the slave became legally and actually free. The owners were never compensated. Plantation owners, realizing that emancipation would destroy their economic system, sometimes moved their slaves as far as possible out of reach of the Union army. By June 1865, the Union Army controlled all of the Confederacy and liberated all of the designated slaves.  Large numbers moved into camps run by the Freedmen's Bureau, where they were given food, shelter, medical care, and arrangements for their employment were made.
The severe dislocations of war and Reconstruction had a large negative impact on the black population, with a large amount of sickness and death. 
The major issues faced by Lincoln were the status of the ex-slaves (called "Freedmen"), the loyalty and civil rights of ex-rebels, the status of the 11 ex-Confederate states, the powers of the federal government needed to prevent a future civil war, and the question of whether Congress or the President would make the major decisions.
Three " Reconstruction Amendments" were passed to expand civil rights for black Americans: the Thirteenth Amendment outlawed slavery; the Fourteenth Amendment guaranteed equal rights for all and citizenship for blacks; the Fifteenth Amendment prevented race from being used to disfranchise men.
Ex-Confederates remained in control of most Southern states for over two years, but changed when the Radical Republicans gained control of Congress in the 1866 elections. President Andrew Johnson, who sought easy terms for reunions with ex-rebels, was virtually powerless in the face of the Radical Republican Congress; he was impeached, but the Senate's attempt to remove him from office failed by one vote. Congress enfranchised black men and temporarily stripped many ex-Confederate leaders of the right to hold office. New Republican governments came to power based on a coalition of Freedmen made up of Carpetbaggers (new arrivals from the North), and Scalawags (native white Southerners). They were backed by the U.S. Army. Opponents said they were corrupt and violated the rights of whites. 
State by state they lost power to a conservative-Democratic coalition, which gained control of the entire South by 1877. In response to Radical Reconstruction, the Ku Klux Klan (KKK) emerged in 1867 as a white-supremacist organization opposed to black civil rights and Republican rule. President Ulysses Grant's vigorous enforcement of the Ku Klux Klan Act of 1870 shut down the Klan, and it disbanded. Paramilitary groups, such as the White League and Red Shirts emerged about 1874 that worked openly to use intimidation and violence to suppress black voting to regain white political power in states across the South during the 1870s. Rable described them as the military arm of the Democratic Party. 
Reconstruction ended after the disputed 1876 election. The Compromise of 1877 gave Republican candidate Rutherford B. Hayes the White House in exchange for removing all remaining federal troops in the South. The federal government withdrew its troops from the South, and Southern Democrats took control of every Southern state.  From 1890 to 1908, southern states effectively disfranchised most black voters and many poor whites by making voter registration more difficult through poll taxes, literacy tests, and other arbitrary devices. They passed segregation laws and imposed second-class status on blacks in a system known as Jim Crow that lasted until the Civil Rights Movement.  
The latter half of the nineteenth century was marked by the rapid development and settlement of the far West, first by wagon trains and riverboats and then aided by the completion of the transcontinental railroad. Large numbers of European immigrants (especially from Germany and Scandinavia) took up low-cost or free farms in the Prairie States. Mining for silver and copper opened up the Mountain West. The United States Army fought frequent small-scale wars with Native Americans as settlers encroached on their traditional lands. Gradually the U.S. purchased the Native American tribal lands and extinguished their claims, forcing most tribes onto subsidized reservations. According to the U.S. Bureau of the Census (1894), from 1789 to 1894:
The Indian wars under the government of the United States have been more than 40 in number. They have cost the lives of about 19,000 white men, women and children, including those killed in individual combats, and the lives of about 30,000 Indians. The actual number of killed and wounded Indians must be very much higher than the given... Fifty percent additional would be a safe estimate... 
The "Gilded Age" was a term that Mark Twain used to describe the period of the late 19th century with a dramatic expansion of American wealth and prosperity, underscored by the mass corruption in the government. Reforms of the Age included the Civil Service Act, which mandated a competitive examination for applicants for government jobs. Other important legislation included the Interstate Commerce Act, which ended railroads' discrimination against small shippers, and the Sherman Antitrust Act, which outlawed monopolies in business. Twain believed that this age was corrupted by such elements as land speculators, scandalous politics, and unethical business practices.  Since the days of Charles A. Beard and Matthew Josephson, some historians have argued that the United States was effectively plutocratic for at least part of the Gilded Age and Progressive Era.      As financiers and industrialists such as J.P. Morgan and John D. Rockefeller began to amass vast fortunes, many U.S. observers were concerned that the nation was losing its pioneering egalitarian spirit. 
By 1890 American industrial production and per capita income exceeded those of all other world nations. In response to heavy debts and decreasing farm prices, wheat and cotton farmers joined the Populist Party.  An unprecedented wave of immigration from Europe served to both provide the labor for American industry and create diverse communities in previously undeveloped areas. From 1880 to 1914, peak years of immigration, more than 22 million people migrated to the United States.  Most were unskilled workers who quickly found jobs in mines, mills, factories. Many immigrants were craftsmen (especially from Britain and Germany) bringing human skills, and others were farmers (especially from Germany and Scandinavia) who purchased inexpensive land on the Prairies from railroads who sent agents to Europe. Poverty, growing inequality and dangerous working conditions, along with socialist and anarchist ideas diffusing from European immigrants, led to the rise of the labor movement, which often included violent strikes.  
Skilled workers banded together to control their crafts and raise wages by forming labor unions in industrial areas of the Northeast. Before the 1930s few factory workers joined the unions in the labor movement. Samuel Gompers led the American Federation of Labor (1886–1924), coordinating multiple unions. Industrial growth was rapid, led by John D. Rockefeller in oil and Andrew Carnegie in steel; both became leaders of philanthropy ( Gospel of Wealth), giving away their fortunes to create the modern system of hospitals, universities, libraries, and foundations.
The Panic of 1893 broke out and was a severe nationwide depression impacting farmers, workers, and businessmen who saw prices, wages, and profits fall.  Many railroads went bankrupt. The resultant political reaction fell on the Democratic Party, whose leader President Grover Cleveland shouldered much of the blame. Labor unrest involved numerous strikes, most notably the violent Pullman Strike of 1894, which was shut down by federal troops under Cleveland's orders. The Populist Party gained strength among cotton and wheat farmers, as well as coal miners, but was overtaken by the even more popular Free Silver movement, which demanded using silver to enlarge the money supply, leading to inflation that the silverites promised would end the depression. 
The financial, railroad, and business communities fought back hard, arguing that only the gold standard would save the economy. In the most intense election in the nation's history, conservative Republican William McKinley defeated silverite William Jennings Bryan, who ran on the Democratic, Populist, and Silver Republican tickets. Bryan swept the South and West, but McKinley ran up landslides among the middle class, industrial workers, cities, and among upscale farmers in the Midwest. 
Prosperity returned under McKinley, the gold standard was enacted, and the tariff was raised. By 1900 the U.S. had the strongest economy on the globe. Apart from two short recessions (in 1907 and 1920) the overall economy remained prosperous and growing until 1929. Republicans, citing McKinley's policies, took the credit. 
Dissatisfaction on the part of the growing middle class with the corruption and inefficiency of politics as usual, and the failure to deal with increasingly important urban and industrial problems, led to the dynamic Progressive Movement starting in the 1890s. In every major city and state, and at the national level as well, and in education, medicine, and industry, the progressives called for the modernization and reform of decrepit institutions, the elimination of corruption in politics, and the introduction of efficiency as a criterion for change. Leading politicians from both parties, most notably Theodore Roosevelt, Charles Evans Hughes, and Robert La Follette on the Republican side, and William Jennings Bryan and Woodrow Wilson on the Democratic side, took up the cause of progressive reform. Women became especially involved in demands for woman suffrage, prohibition, and better schools; their most prominent leader was Jane Addams of Chicago, who created settlement houses. "Muckraking" journalists such as Upton Sinclair, Lincoln Steffens and Jacob Riis exposed corruption in business and government along with rampant inner city poverty. Progressives implemented anti-trust laws and regulated such industries of meat-packing, drugs, and railroads. Four new constitutional amendments – the Sixteenth through Nineteenth – resulted from progressive activism, bringing the federal income tax, direct election of Senators, prohibition, and woman suffrage.  The period also saw a major transformation of the banking system with the creation of the Federal Reserve System in 1913  and the arrival of cooperative banking in the US with the founding of the first credit union in 1908.  The Progressive Movement lasted through the 1920s; the most active period was 1900–18. 
The United States emerged as a world economic and military power after 1890. The main episode was the Spanish–American War, which began when Spain refused American demands to reform its oppressive policies in Cuba.  The "splendid little war", as one official called it, involved a series of quick American victories on land and at sea. At the Treaty of Paris peace conference the United States acquired the Philippines, Puerto Rico, and Guam. 
Cuba became an independent country, under close American tutelage. Although the war itself was widely popular, the peace terms proved controversial. William Jennings Bryan led his Democratic Party in opposition to control of the Philippines, which he denounced as imperialism unbecoming to American democracy.  President William McKinley defended the acquisition and was riding high as the nation had returned to prosperity and felt triumphant in the war. McKinley easily defeated Bryan in a rematch in the 1900 presidential election. 
After defeating an insurrection by Filipino nationalists, the United States engaged in a large-scale program to modernize the economy of the Philippines and dramatically upgrade the public health facilities.  By 1908, however, Americans lost interest in an empire and turned their international attention to the Caribbean, especially the building of the Panama Canal. In 1912 when Arizona became the final mainland state, the American Frontier came to an end. The canal opened in 1914 and increased trade with Japan and the rest of the Far East. A key innovation was the Open Door Policy, whereby the imperial powers were given equal access to Chinese business, with not one of them allowed to take control of China. 
As World War I raged in Europe from 1914, President Woodrow Wilson took full control of foreign policy, declaring neutrality but warning Germany that resumption of unrestricted submarine warfare against American ships supplying goods to Allied nations would mean war. Germany decided to take the risk and try to win by cutting off supplies to Britain through the sinking of ships such as the RMS Lusitania; the U.S. declared war in April 1917 mainly from the threat of the Zimmermann telegram.  American money, food, and munitions arrived quickly, but troops had to be drafted and trained; by summer 1918 American soldiers under General John J. Pershing's American Expeditionary Forces arrived at the rate of 10,000 a day, while Germany was unable to replace its losses.  Dissent against the war was suppressed by the Sedition Act of 1918 & Espionage Act of 1917, German language, leftist & pacifist publications were suppressed, and over 2,000 were imprisoned for speaking out against the war, the political prisoners were later released by U.S President Warren G. Harding. 
The result was Allied victory in November 1918. President Wilson demanded Germany depose the Kaiser and accept his terms in the famed Fourteen Points speech. Wilson dominated the 1919 Paris Peace Conference but Germany was treated harshly by the Allies in the Treaty of Versailles (1919) as Wilson put all his hopes in the new League of Nations. Wilson refused to compromise with Senate Republicans over the issue of Congressional power to declare war, and the Senate rejected the Treaty and the League. 
The women's suffrage movement began with the June 1848 National Convention of the Liberty Party. Presidential candidate Gerrit Smith argued for and established women's suffrage as a party plank. One month later, his cousin Elizabeth Cady Stanton joined with Lucretia Mott and other women to organize the Seneca Falls Convention, featuring the Declaration of Sentiments demanding equal rights for women, and the right to vote.  Many of these activists became politically aware during the abolitionist movement. The women's rights campaign during " first-wave feminism" was led by Stanton, Lucy Stone and Susan B. Anthony, among many others. Stone and Paulina Wright Davis organized the prominent and influential National Women's Rights Convention in 1850. The movement reorganized after the Civil War, gaining experienced campaigners, many of whom had worked for prohibition in the Women's Christian Temperance Union. By the end of the 19th century a few western states had granted women full voting rights,  though women had made significant legal victories, gaining rights in areas such as property and child custody. 
Around 1912 the feminist movement began to reawaken, putting an emphasis on its demands for equality and arguing that the corruption of American politics demanded purification by women because men could not do that job.  Protests became increasingly common as suffragette Alice Paul led parades through the capital and major cities. Paul split from the large National American Woman Suffrage Association (NAWSA), which favored a more moderate approach and supported the Democratic Party and Woodrow Wilson, led by Carrie Chapman Catt, and formed the more militant National Woman's Party. Suffragists were arrested during their " Silent Sentinels" pickets at the White House, the first time such a tactic was used, and were taken as political prisoners. 
The old anti-suffragist argument that only men could fight a war, and therefore only men deserve the right to vote, was refuted by the enthusiastic participation of tens of thousands of American women on the home front in World War I. Across the world, grateful nations gave women the right to vote. Furthermore, most of the Western states had already given the women the right to vote in state and national elections, and the representatives from those states, including the first woman Jeannette Rankin of Montana, demonstrated that woman suffrage was a success. The main resistance came from the south, where white leaders were worried about the threat of black women voting. Congress passed the Nineteenth Amendment in 1919, and women could vote in 1920. 
NAWSA became the League of Women Voters, and the National Woman's Party began lobbying for full equality and the Equal Rights Amendment, which would pass Congress during the second wave of the women's movement in 1972. Politicians responded to the new electorate by emphasizing issues of special interest to women, especially prohibition, child health, and world peace.   The main surge of women voting came in 1928, when the big-city machines realized they needed the support of women to elect Al Smith, a Catholic from New York City. Meanwhile, Protestants mobilized women to support Prohibition and vote for Republican Herbert Hoover. 
In the 1920s the U.S. grew steadily in stature as an economic and military world power. The United States Senate did not ratify the Treaty of Versailles imposed by its Allies on the defeated Central Powers; instead, the United States chose to pursue unilateralism.  The aftershock of Russia's October Revolution resulted in real fears of Communism in the United States, leading to a Red Scare and the deportation of aliens considered subversive.
In 1920, the manufacture, sale, import and export of alcohol were prohibited by the Eighteenth Amendment, Prohibition. The result was that in cities illegal alcohol became a big business, largely controlled by racketeers. The second Ku Klux Klan grew rapidly in 1922–25, then collapsed. Immigration laws were passed to strictly limit the number of new entries. The 1920s were called the Roaring Twenties due to the great economic prosperity during this period. Jazz became popular among the younger generation, and thus the decade was also called the Jazz Age.
The Great Depression (1929–39) and the New Deal (1933–36) were decisive moments in American political, economic, and social history that reshaped the nation. 
During the 1920s, the nation enjoyed widespread prosperity, albeit with a weakness in agriculture. A financial bubble was fueled by an inflated stock market, which later led to the Stock Market Crash on October 29, 1929.  This, along with many other economic factors, triggered a worldwide depression known as the Great Depression. During this time, the United States experienced deflation as prices fell, unemployment soared from 3% in 1929 to 25% in 1933, farm prices fell by half, and manufacturing output plunged by one-third.
In 1932, Democratic presidential nominee Franklin D. Roosevelt promised "a New Deal for the American people", coining the enduring label for his domestic policies. The result was a series of permanent reform programs including Relief for the unemployed, assistance for the elderly, jobs for young men, social security, unemployment insurance, public housing, bankruptcy insurance, farm subsidies, and regulation of financial securities. State governments added new programs as well, and introduced the sales tax to pay for them. Ideologically the revolution established modern liberalism in the United States and kept the Democrats in power in Washington almost continuously for Three decades thanks to the New Deal Coalition of ethnic Whites, Blacks, blue-collar workers, labor unions, and white Southerners. It provided relief to the long-term unemployed through numerous programs, such as the Works Progress Administration (WPA) and for young men, the Civilian Conservation Corps. Large scale spending projects designed to provide private sector construction jobs and rebuild the infrastructure were under the purview of the Public Works Administration. The Second New Deal was a turn to the left in 1935–36, building up labor unions through the Wagner Act. Unions became a powerful element of the merging New Deal Coalition, which won reelection for Roosevelt in 1936, 1940, and 1944 by mobilizing union members, blue collar workers, relief recipients, big city machines, ethnic, and religious groups (especially Catholics and Jews) and the white South, along with blacks in the North (where they could vote). Roosevelt seriously weakened his second term by a failed effort to pack the Supreme Court, which had been a center of conservative resistance to his programs. Most of the relief programs were dropped after 1938 in the 1940s when the conservatives regained power in Congress through the Conservative Coalition. Of special importance is the Social Security program, begun in 1935. The economy basically recovered by 1936, but had a sharp, short recession in 1937-38; long-term unemployment, however, remained a problem until it was solved by wartime spending. 
In the Depression years, the United States remained focused on domestic concerns while democracy declined across the world and many countries fell under the control of dictators. Imperial Japan asserted dominance in East Asia and in the Pacific. Nazi Germany and Fascist Italy militarized and threatened conquests, while Britain and France attempted appeasement to avert another war in Europe. U.S. legislation in the Neutrality Acts sought to avoid foreign conflicts; however, policy clashed with increasing anti-Nazi feelings following the German invasion of Poland in September 1939 that started World War II. Roosevelt positioned the U.S. as the " Arsenal of Democracy", pledging full-scale financial and munitions support for the Allies – but no military personnel.  This was carried out through the Lend-Lease agreements. Japan tried to neutralize America's power in the Pacific by attacking Pearl Harbor on December 7, 1941, which catalyzed American support to enter the war. 
The main contributions of the U.S. to the Allied war effort comprised money, industrial output, food, petroleum, technological innovation, and (especially 1944–45), military personnel. Much of the focus in Washington was maximizing the economic output of the nation. The overall result was a dramatic increase in GDP, the export of vast quantities of supplies to the Allies and to American forces overseas, the end of unemployment, and a rise in civilian consumption even as 40% of the GDP went to the war effort. This was achieved by tens of millions of workers moving from low-productivity occupations to high efficiency jobs, improvements in productivity through better technology and management, and the move into the active labor force of students, retired people, housewives, and the unemployed, and an increase in hours worked.
It was exhausting; leisure activities declined sharply. People tolerated the extra work because of patriotism, the pay, and the confidence that it was only "for the duration", and life would return to normal as soon as the war was won. Most durable goods became unavailable, and meat, clothing, and gasoline were tightly rationed. In industrial areas housing was in short supply as people doubled up and lived in cramped quarters. Prices and wages were controlled, and Americans saved a high portion of their incomes, which led to renewed growth after the war instead of a return to depression.  
The Allies – the United States, Britain, and the Soviet Union, China, as well as Poland, Canada and other countries – fought the Axis powers of Germany, Italy, and Japan. The Allies saw Germany as the main threat and gave highest priority to Europe. The U.S. dominated the war against Japan and stopped Japanese expansion in the Pacific in 1942. After losing Pearl Harbor and in the Philippines to the Japanese, and drawing the Battle of the Coral Sea (May 1942), the American Navy inflicted a decisive blow at Midway (June 1942). American ground forces assisted in the North African Campaign that eventually concluded with the collapse of Mussolini's fascist government in 1943, as Italy switched to the Allied side. A more significant European front was opened on D-Day, June 6, 1944, in which American and Allied forces invaded Nazi-occupied France from Britain.
On the home front, mobilization of the U.S. economy was managed by Roosevelt's War Production Board. The wartime production boom led to full employment, wiping out this vestige of the Great Depression. Indeed, labor shortages encouraged industry to look for new sources of workers, finding new roles for women and blacks. 
However, the fervor also inspired anti-Japanese sentiment, leading to internment of Japanese Americans.  This was taken under the directive of President Roosevelt, who signed Executive Order 9066. The terms of this executive order resulted in some 120,000 people of Japanese descent living in the US removed from their homes and placed in internment camps. Two-thirds of those interned were American citizens and half of them were children. Those who were as little as 1/16 Japanese  and orphaned infants with "one drop of Japanese blood" were placed in internment camps.  The US Supreme Court held the Japanese American internment camps to be constitutional in a 6–3 decision in Korematsu v. United States Supreme Court case. 
Research and development took flight as well, best seen in the Manhattan Project, a secret effort to harness nuclear fission to produce highly destructive atomic bombs.  From 1942 to 1946, the project was under the direction of Major General Leslie Groves of the U.S. Army Corps of Engineers. Nuclear physicist J. Robert Oppenheimer was the director of the Los Alamos Laboratory that designed the actual bombs. The first nuclear device ever detonated was an implosion-type bomb at the Trinity test, conducted at New Mexico's Alamogordo Bombing and Gunnery Range on 16 July 1945. 
The Allies pushed the Germans out of France but faced an unexpected counterattack at the Battle of the Bulge in December. The final German effort failed, and, as Allied armies in East and West were converging on Berlin, the Nazis hurriedly tried to kill the last remaining Jews. The western front stopped short, leaving Berlin to the Soviets as the Nazi regime formally capitulated in May 1945, ending the war in Europe.  Over in the Pacific, the U.S. implemented an island hopping strategy toward Tokyo, establishing airfields for bombing runs against mainland Japan from the Mariana Islands and achieving hard-fought victories at Iwo Jima and Okinawa in 1945.  Bloodied at Okinawa, the U.S. prepared to invade Japan's home islands when B-29s dropped atomic bombs on the Japanese cities of Hiroshima and Nagasaki, forcing the empire's surrender in a matter of days and thus ending World War II.  The U.S. occupied Japan (and part of Germany), sending Douglas MacArthur to restructure the Japanese economy and political system along American lines.  During the war, Roosevelt coined the term " Four Powers" to refer four major Allies of World War II, the United States, the United Kingdom, the Soviet Union and China, which later became the foundation of the United Nations Security Council. 
Though the nation lost more than 400,000 military personnel,  the mainland prospered untouched by the devastation of war that inflicted a heavy toll on Europe and Asia.
Participation in postwar foreign affairs marked the end of predominant American isolationism. The awesome threat of nuclear weapons inspired both optimism and fear. Nuclear weapons were never used after 1945, as both sides drew back from the brink and a "long peace" characterized the Cold War years, starting with the Truman Doctrine on May 22, 1947. There were, however, regional wars in Korea and Vietnam. 
Following World War II, the United States emerged as one of the two dominant superpowers, the USSR being the other. The U.S. Senate on a bipartisan vote approved U.S. participation in the United Nations (UN), which marked a turn away from the traditional isolationism of the U.S. and toward increased international involvement.
The primary American goal of 1945–48 was to rescue Europe from the devastation of World War II and to contain the expansion of Communism, represented by the Soviet Union. U.S. foreign policy during the Cold War was built around the support of Western Europe and Japan along with the policy of containment, stopping the spread of communism. The U.S. joined the wars in Korea and Vietnam and toppled left-wing governments in the third world to try to stop its spread.  The Truman Doctrine of 1947 provided military and economic aid to Greece and Turkey to counteract the threat of Communist expansion in the Balkans. In 1948, the United States replaced piecemeal financial aid programs with a comprehensive Marshall Plan, which pumped money into the economy of Western Europe, and removed trade barriers, while modernizing the managerial practices of businesses and governments. 
The Plan's $13 billion budget was in the context of a U.S. GDP of $258 billion in 1948 and was in addition to the $12 billion in American aid given to Europe between the end of the war and the start of the Marshall Plan. Soviet head of state Joseph Stalin prevented his satellite states from participating, and from that point on, Eastern Europe, with inefficient centralized economies, fell further and further behind Western Europe in terms of economic development and prosperity. In 1949, the United States, rejecting the long-standing policy of no military alliances in peacetime, formed the North Atlantic Treaty Organization (NATO) alliance, which continues into the 21st century. In response the Soviets formed the Warsaw Pact of communist states, leading to the " iron curtain".  In August 1949 the Soviets tested their first nuclear weapon, thereby escalating the risk of warfare. The threat of mutually assured destruction however, prevented both powers from nuclear war, and resulted in proxy wars, especially in Korea and Vietnam, in which the two sides did not directly confront each other. 
President Dwight D Eisenhower, elected in a landslide as the first Republican president since 1932, had a lasting impact on American life and politics.  He ended the Korean War, and avoided any other major conflict. He cut military spending by reliance on very high technology, such as nuclear weapons carried by long-range bombers and intercontinental missiles. He gave strong support to the NATO alliance, and built other alliances along similar lines, but they never were especially effective. After Stalin died in 1953 he worked to obtain friendlier relationships with the Soviet Union. At home he ended McCarthyism, expanded the Social Security program and presided over a decade of bipartisan comity. He promoted civil rights cautiously, and sent in the Army when trouble threatened over racial integration in Little Rock Arkansas.  The unexpected leapfrogging of American technology by the Soviets in 1957 with Sputnik, the first Earth satellite, began the Space Race, won in 1969 by the Americans as Apollo 11 landed astronauts on the Moon. The angst about the weaknesses of American education led to large-scale federal support for science education and research.  In the decades after World War II, the United States became a global influence in economic, political, military, cultural, and technological affairs.
In 1960, the charismatic John F. Kennedy was elected as the first and – thus far – only Roman Catholic President. The Kennedy clan brought a new life and vigor to the atmosphere of the White House. His time in office was marked by such notable events as the acceleration of the United States' role in the Space Race, escalation of the American role in the Vietnam War, the Bay of Pigs Invasion, the Cuban Missile Crisis, the jailing of Martin Luther King, Jr. during the Birmingham campaign. Kennedy was assassinated on November 22, 1963, leaving the nation in profound shock. 
The climax of liberalism came in the mid-1960s with the success of President Lyndon B. Johnson (1963–1969) in securing congressional passage of his Great Society programs.  They included civil rights, the end of legal segregation, Medicare, extension of welfare, federal aid to education at all levels, subsidies for the arts and humanities, environmental activism, and a series of programs designed to wipe out poverty.   As recent historians have explained:
Gradually, liberal intellectuals crafted a new vision for achieving economic and social justice. The liberalism of the early 1960s contained no hint of radicalism, little disposition to revive new deal era crusades against concentrated economic power, and no intention to redistribute wealth or restructure existing institutions. Internationally it was strongly anti-Communist. It aimed to defend the free world, to encourage economic growth at home, and to ensure that the resulting plenty was fairly distributed. Their agenda-much influenced by Keynesian economic theory-envisioned massive public expenditure that would speed economic growth, thus providing the public resources to fund larger welfare, housing, health, and educational programs. 
Johnson was rewarded with an electoral landslide in 1964 against conservative Barry Goldwater, which broke the decades-long control of Congress by the Conservative Coalition. However, the Republicans bounced back in 1966 and elected Richard Nixon in 1968. Nixon largely continued the New Deal and Great Society programs he inherited; conservative reaction would come with the election of Ronald Reagan in 1980.  Meanwhile, the American people completed a great migration from farms into the cities and experienced a period of sustained economic expansion.
Starting in the late 1950s, institutionalized racism across the United States, but especially in the South, was increasingly challenged by the growing Civil Rights Movement. The activism of African-American leaders Rosa Parks and Martin Luther King, Jr. led to the Montgomery Bus Boycott, which launched the movement. For years African Americans would struggle with violence against them but would achieve great steps toward equality with Supreme Court decisions, including Brown v. Board of Education and Loving v. Virginia, the Civil Rights Act of 1964, the Voting Rights Act of 1965, and the Fair Housing Act of 1968, which ended the Jim Crow laws that legalized racial segregation between whites and blacks. 
Martin Luther King, Jr., who had won the Nobel Peace Prize for his efforts to achieve equality of the races, was assassinated in 1968. Following his death others led the movement, most notably King's widow, Coretta Scott King, who was also active, like her husband, in the Opposition to the Vietnam War, and in the Women's Liberation Movement. There were 164 riots in 128 American cities in the first nine months of 1967.  Frustrations with the seemingly slow progress of the integration movement led to the emergence of more radical discourses during the early 1960s, which, in turn, gave rise to the Black Power movement of the late 1960s and early 1970s.  The decade would ultimately bring about positive strides toward integration, especially in government service, sports, and entertainment. Native Americans turned to the federal courts to fight for their land rights. They held protests highlighting the federal government's failure to honor treaties. One of the most outspoken Native American groups was the American Indian Movement (AIM). In the 1960s, Cesar Chavez began organizing poorly paid Mexican-American farm workers in California. He led a five-year-long strike by grape pickers. Then Chávez formed the nation's first successful union of farm workers. His United Farm Workers of America (UFW) faltered after a few years but after Chavez died in 1993 he became an iconic "folk saint" in the pantheon of Mexican Americans. 
A new consciousness of the inequality of American women began sweeping the nation, starting with the 1963 publication of Betty Friedan's best-seller, The Feminine Mystique, which explained how many housewives felt trapped and unfulfilled, assaulted American culture for its creation of the notion that women could only find fulfillment through their roles as wives, mothers, and keepers of the home, and argued that women were just as able as men to do every type of job. In 1966 Friedan and others established the National Organization for Women, or NOW, to act for women as the NAACP did for African Americans.  
Protests began, and the new Women's Liberation Movement grew in size and power, gained much media attention, and, by 1968, had replaced the Civil Rights Movement as the U.S's main social revolution. Marches, parades, rallies, boycotts, and pickets brought out thousands, sometimes millions. There were striking gains for women in medicine, law, and business, while only a few were elected to office. The Movement was split into factions by political ideology early on, however (with NOW on the left, the Women's Equity Action League (WEAL) on the right, the National Women's Political Caucus (NWPC) in the center, and more radical groups formed by younger women on the far left). The proposed Equal Rights Amendment to the Constitution, passed by Congress in 1972 was defeated by a conservative coalition mobilized by Phyllis Schlafly. They argued that it degraded the position of the housewife and made young women susceptible to the military draft.  
However, many federal laws (i.e., those equalizing pay, employment, education, employment opportunities, and credit; ending pregnancy discrimination; and requiring NASA, the Military Academies, and other organizations to admit women), state laws (i.e., those ending spousal abuse and marital rape), Supreme Court rulings (i.e. ruling that the equal protection clause of the Fourteenth Amendment applied to women), and state ERAs established women's equal status under the law, and social custom and consciousness began to change, accepting women's equality. The controversial issue of abortion, deemed by the Supreme Court as a fundamental right in Roe v. Wade (1973), is still a point of debate today. 
Amid the Cold War, the United States entered the Vietnam War, whose growing unpopularity fed already existing social movements, including those among women, minorities, and young people. President Lyndon B. Johnson's Great Society social programs and numerous rulings by the Warren Court added to the wide range of social reform during the 1960s and 1970s. Feminism and the environmental movement became political forces, and progress continued toward civil rights for all Americans. The Counterculture Revolution swept through the nation and much of the western world in the late sixties and early seventies, further dividing Americans in a "culture war" but also bringing forth more liberated social views. 
Johnson was succeeded in 1969 by Republican Richard Nixon, who attempted to gradually turn the war over to the South Vietnamese forces. He negotiated the peace treaty in 1973 which secured the release of POWs and led to the withdrawal of U.S. troops. The war had cost the lives of 58,000 American troops. Nixon manipulated the fierce distrust between the Soviet Union and China to the advantage of the United States, achieving détente (relaxation; ease of tension) with both parties. 
The Watergate scandal, involving Nixon's cover-up of his operatives' break-in into the Democratic National Committee headquarters at the Watergate office complex destroyed his political base, sent many aides to prison, and forced Nixon's resignation on August 9, 1974. He was succeeded by Vice President Gerald Ford. The Fall of Saigon ended the Vietnam War and resulted in North and South Vietnam being reunited. Communist victories in neighboring Cambodia and Laos occurred in the same year. 
The OPEC oil embargo marked a long-term economic transition since, for the first time, energy prices skyrocketed, and American factories faced serious competition from foreign automobiles, clothing, electronics, and consumer goods. By the late 1970s the economy suffered an energy crisis, slow economic growth, high unemployment, and very high inflation coupled with high interest rates (the term stagflation was coined). Since economists agreed on the wisdom of deregulation, many of the New Deal era regulations were ended, such as in transportation, banking, and telecommunications. 
Jimmy Carter, running as someone who was not a part of the Washington political establishment, was elected president in 1976.  On the world stage, Carter brokered the Camp David Accords between Israel and Egypt. In 1979, Iranian students stormed the U.S. embassy in Tehran and took 66 Americans hostage, resulting in the Iran hostage crisis. With the hostage crisis and continuing stagflation, Carter lost the 1980 election to the Republican Ronald Reagan.  On January 20, 1981, minutes after Carter's term in office ended, the remaining U.S. captives held at the U.S. embassy in Iran were released, ending the 444-day hostage crisis. 
Ronald Reagan produced a major realignment with his 1980 and 1984 landslide elections. Reagan's economic policies (dubbed " Reaganomics") and the implementation of the Economic Recovery Tax Act of 1981 lowered the top marginal tax rate from 70% to 28% over the course of seven years.  Reagan continued to downsize government taxation and regulation.  The U.S. experienced a recession in 1982, but the negative indicators reversed, with the inflation rate decreasing from 11% to 2%, the unemployment rate decreasing from 10.8% in December 1982 to 7.5% in November 1984,  and the economic growth rate increasing from 4.5% to 7.2%. 
Reagan ordered a buildup of the U.S. military, incurring additional budget deficits. Reagan introduced a complicated missile defense system known as the Strategic Defense Initiative (SDI) (dubbed "Star Wars" by opponents) in which, theoretically, the U.S. could shoot down missiles with laser systems in space. The Soviets reacted harshly because they thought it violated the 1972 Anti-Ballistic Missile Treaty, and would upset the balance of power by giving the U.S. a major military advantage. For years Soviet leader Mikhail Gorbachev argued vehemently against SDI. However, by the late 1980s he decided the system would never work and should not be used to block disarmament deals with the U.S.  Historians argue how great an impact the SDI threat had on the Soviets – whether it was enough to force Gorbachev to initiate radical reforms, or whether the deterioration of the Soviet economy alone forced the reforms. There is agreement that the Soviets realized they were well behind the Americans in military technology, that to try to catch up would be very expensive, and that the military expenses were already a very heavy burden slowing down their economy. 
Reagan's Invasion of Grenada and bombing of Libya were popular in the U.S, though his backing of the Contras rebels was mired in the controversy over the Iran–Contra affair that revealed Reagan's poor management style. 
Reagan met four times with Soviet leader Mikhail Gorbachev, who ascended to power in 1985, and their summit conferences led to the signing of the Intermediate-Range Nuclear Forces Treaty. Gorbachev tried to save Communism in the Soviet Union first by ending the expensive arms race with America,  then by shedding the East European empire in 1989. The Soviet Union collapsed on Christmas Day 1991, ending the U.S–Soviet Cold War.
The United States emerged as the world's sole remaining superpower and continued to intervene in international affairs during the 1990s, including the 1991 Gulf War against Iraq. Following his election in 1992, President Bill Clinton oversaw one of the longest periods of economic expansion and unprecedented gains in securities values, a side effect of the digital revolution and new business opportunities created by the Internet. He also worked with the Republican Congress to pass the first balanced federal budget in 30 years. 
In 1998, Clinton was impeached by the House of Representatives on charges of lying about a sexual relationship with White House intern Monica Lewinsky. He was acquitted by the Senate. The failure of impeachment and the Democratic gains in the 1998 election forced House Speaker Newt Gingrich, a Republican, to resign from Congress. 
The Republican Party expanded its base throughout the South after 1968 (excepting 1976), largely due to its strength among socially conservative white Evangelical Protestants and traditionalist Roman Catholics, added to its traditional strength in the business community and suburbs. As white Democrats in the South lost dominance of the Democratic Party in the 1990s, the region took on the two-party apparatus which characterized most of the nation. The Republican Party's central leader by 1980 was Ronald Reagan, whose conservative policies called for reduced government spending and regulation, lower taxes, and a strong anti- Soviet foreign policy. His iconic status in the party persists into the 21st century, as practically all Republican Party leaders acknowledge his stature. Social scientists Theodore Caplow et al. argue, "The Republican party, nationally, moved from right-center toward the center in 1940s and 1950s, then moved right again in the 1970s and 1980s." They add: "The Democratic party, nationally, moved from left-center toward the center in the 1940s and 1950s, then moved further toward the right-center in the 1970s and 1980s." 
The presidential election in 2000 between George W. Bush and Al Gore was one of the closest in U.S. history and helped lay the seeds for political polarization to come. The vote in the decisive state of Florida was extremely close and produced a dramatic dispute over the counting of votes. The U.S. Supreme Court in Bush v. Gore ended the recount with a 5–4 vote. That meant Bush, then in the lead, carried Florida and the election.  Including 2000, the Democrats outpolled the Republicans in the national vote in every election from 1992 to 2016, except for 2004.
On September 11, 2001 ("9/11"), the United States was struck by a terrorist attack when 19 al-Qaeda hijackers commandeered four airliners to be used in suicide attacks and intentionally crashed two into both twin towers of the World Trade Center and the third into the Pentagon, killing 2,937 victims—206 aboard the three airliners, 2,606 who were in the World Trade Center and on the ground, and 125 who were in the Pentagon.  The fourth plane was re-taken by the passengers and crew of the aircraft. While they were not able to land the plane safely, they were able to re-take control of the aircraft and crash it into an empty field in Pennsylvania, killing all 44 people including the four terrorists on board, thereby saving whatever target the terrorists were aiming for. Within two hours, both Twin Towers of the World Trade Center completely collapsed causing massive damage to the surrounding area and blanketing Lower Manhattan in toxic dust clouds. All in all, a total of 2,977 victims perished in the attacks. In response, President George W. Bush on September 20 announced a "War on Terror". On October 7, 2001, the United States and NATO then invaded Afghanistan to oust the Taliban regime, which had provided safe haven to al-Qaeda and its leader Osama bin Laden. 
The federal government established new domestic efforts to prevent future attacks. The controversial USA PATRIOT Act increased the government's power to monitor communications and removed legal restrictions on information sharing between federal law enforcement and intelligence services. A cabinet-level agency called the Department of Homeland Security was created to lead and coordinate federal counter-terrorism activities.  Some of these anti-terrorism efforts, particularly the U.S. government's handling of detainees at the prison at Guantanamo Bay, led to allegations against the U.S. government of human rights violations.  
In 2003, from March 19 to May 1, the United States launched an invasion of Iraq, which led to the collapse of the Iraq government and the eventual capture of Iraqi dictator Saddam Hussein, with whom the U.S. had long-standing tense relations. The reasons for the invasion cited by the Bush administration included the spreading of democracy, the elimination of weapons of mass destruction  (a key demand of the UN as well, though later investigations found parts of the intelligence reports to be inaccurate),  and the liberation of the Iraqi people. Despite some initial successes early in the invasion, the continued Iraq War fueled international protests and gradually saw domestic support decline as many people began to question whether or not the invasion was worth the cost.   In 2007, after years of violence by the Iraqi insurgency, President Bush deployed more troops in a strategy dubbed " the surge". While the death toll decreased, the political stability of Iraq remained in doubt. 
In 2008, the unpopularity of President Bush and the Iraq war, along with the 2008 financial crisis, led to the election of Barack Obama, the first African-American President of the United States.  After his election, Obama reluctantly continued the war effort in Iraq until August 31, 2010, when he declared that combat operations had ended. However, 50,000 American soldiers and military personnel were kept in Iraq to assist Iraqi forces, help protect withdrawing forces, and work on counter-terrorism until December 15, 2011, when the war was declared formally over and the last troops left the country.  At the same time, Obama increased American involvement in Afghanistan, starting a surge strategy using an additional 30,000 troops, while proposing to begin withdrawing troops sometime in December 2014. With regards to Guantanamo Bay, President Obama forbade torture but in general retained Bush's policy regarding the Guantanamo detainees, while also proposing that the prison eventually be closed.  
In May 2011, after nearly a decade in hiding, the founder and leader of Al Qaeda, Osama bin Laden, was killed in Pakistan in a raid conducted by U.S. naval special forces acting under President Obama's direct orders. While Al Qaeda was near collapse in Afghanistan, affiliated organizations continued to operate in Yemen and other remote areas as the CIA used drones to hunt down and remove its leadership.  
The Boston Marathon Bombing was a bombing incident, followed by subsequent related shootings, that occurred when two pressure cooker bombs exploded during the Boston Marathon on April 15, 2013. The bombs exploded about 12 seconds and 210 yards (190 m) apart at 2:49 pm EDT, near the marathon's finish line on Boylston Street. They killed 3 people and injured an estimated 264 others.
The Islamic State of Iraq and the Levant – formerly known as Al-Qaeda in Iraq – rose to prominence in September 2014. In addition to taking control of much of Western Iraq and Eastern Syria, ISIS also beheaded three journalists, two American and one British. These events lead to a major military offensive by the United States and its allies in the region.
On December 28, 2014, President Obama officially ended the combat mission in Afghanistan and promised a withdrawal of all remaining U.S. troops at the end of 2016 with the exception of the embassy guards. 
In September 2008, the United States, and most of Europe, entered the longest post–World War II recession, often called the "Great Recession".   Multiple overlapping crises were involved, especially the housing market crisis, a subprime mortgage crisis, soaring oil prices, an automotive industry crisis, rising unemployment, and the worst financial crisis since the Great Depression. The financial crisis threatened the stability of the entire economy in September 2008 when Lehman Brothers failed and other giant banks were in grave danger.  Starting in October the federal government lent $245 billion to financial institutions through the Troubled Asset Relief Program  which was passed by bipartisan majorities and signed by Bush. 
Following his election victory by a wide electoral margin in November 2008, Bush's successor – Barack Obama – signed into law the American Recovery and Reinvestment Act of 2009, which was a $787 billion economic stimulus aimed at helping the economy recover from the deepening recession. Obama, like Bush, took steps to rescue the auto industry and prevent future economic meltdowns. These included a bailout of General Motors and Chrysler, putting ownership temporarily in the hands of the government, and the " cash for clunkers" program which temporarily boosted new car sales. 
The recession officially ended in June 2009, and the economy slowly began to expand once again.  The unemployment rate peaked at 10.1% in October 2009 after surging from 4.7% in November 2007, and returned to 5.0% as of October 2015. However, overall economic growth has remained weaker in the 2010s compared to expansions in previous decades.   
From 2009 to 2010, the 111th Congress passed major legislation such as the Patient Protection and Affordable Care Act, informally known as Obamacare, the Dodd–Frank Wall Street Reform and Consumer Protection Act  and the Don't Ask, Don't Tell Repeal Act, which were signed into law by President Obama.  Following the 2010 midterm elections, which resulted in a Republican-controlled House of Representatives and a Democratic-controlled Senate,  Congress presided over a period of elevated gridlock and heated debates over whether or not to raise the debt ceiling, extend tax cuts for citizens making over $250,000 annually, and many other key issues.  These ongoing debates led to President Obama signing the Budget Control Act of 2011. In the Fall of 2012, Mitt Romney challenged Barack Obama for the Presidency. Following Obama's reelection in November 2012, Congress passed the American Taxpayer Relief Act of 2012 – which resulted in an increase in taxes primarily on those earning the most money. Congressional gridlock continued as Congressional Republicans' call for the repeal of the Patient Protection and Affordable Care Act – popularly known as "Obamacare" – along with other various demands, resulted in the first government shutdown since the Clinton administration and almost led to the first default on U.S. debt since the 19th century. As a result of growing public frustration with both parties in Congress since the beginning of the decade, Congressional approval ratings fell to record lows, with only 11% of Americans approving as of October 2013. 
Other major events that have occurred during the 2010s include the rise of new political movements, such as the conservative Tea Party movement and the liberal Occupy movement. There was also unusually severe weather during the early part of the decade. In 2012, over half the country experienced record drought and Hurricane Sandy caused massive damage to coastal areas of New York and New Jersey.
The debate over the issue of rights for the LGBT community, most notably that of same-sex marriage, began to shift in favor of same-sex couples, and has been reflected in dozens of polls released in the early part of the decade.  In 2012, President Obama became the first president to openly support same-sex marriage, and the 2013 Supreme Court decision in the case of United States v. Windsor provided for federal recognition of same-sex unions. In June 2015, the Supreme Court legalized gay marriage nationally in the case of Obergefell v. Hodges.
Political debate has continued over issues such as tax reform, immigration reform, income inequality and U.S. foreign policy in the Middle East, particularly with regards to global terrorism, the rise of the Islamic State of Iraq and the Levant and an accompanying climate of Islamophobia. 
On November 8, 2016, Republican Party presidential nominee Donald Trump defeated Democratic nominee Hillary Clinton to become the President-elect of the United States.  Trump's election became mired in controversy after U.S. intelligence agencies concluded that associates of the Russian government interfered in the election "to undermine public faith in the U.S. democratic process". This, along with questions about potential collusion between the Trump campaign and Russian officials, led to the launch of investigations into the matter by the FBI, and the Senate and the House Intelligence Committees.  
- American urban history
- Colonial history of the United States
- Economic history of the United States
- History of agriculture in the United States
- History of education in the United States
- History of United States foreign policy
- History of immigration to the United States
- History of religion in the United States
- History of the Southern United States
- History of women in the United States
- List of historians by area of study#History of the United States
- List of history journals#United States and Canada
- List of Presidents of the United States
- Military history of the United States
- Outline of United States history
- Politics of the United States
- Territorial evolution of the United States
- Territories of the United States
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- A new way of calculating casualties by looking at the deviation of the death rate of men of fighting age from the norm through analysis of census data found that at least 627,000 and at most 888,000 people, but most likely 761,000 people, died through the war. J. David Hacker, "Recounting the Dead," New York Times Sept 20, 2011. For more details see J. David Hacker, "A census-based count of the Civil War dead." Civil War History 57.4 (2011): 307–348.
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- Edward M. Coffman, The War to End All Wars: The American Military Experience in World War I (1998)
- "American Political Prisoners: Prosecutions under the Espionage and Sedition Acts. By Stephen M. Kohn. (Westport: Praeger, 1994. xviii, 216 pp. $49.00, ISBN 0-275-94415-8.)". Journal of American History. 82 (4): 1688–1688. March 1, 1996. doi: 10.1093/jahist/82.4.1688-a. ISSN 0021-8723.
- John Milton Cooper, Breaking the Heart of the World: Woodrow Wilson and the Fight for the League of Nations (2001)
- The Seneca Falls Convention was preceded by the Anti-Slavery Convention of American Women in 1837 held in New York City, at which women's rights issues were debated, especially African-American women's rights. Gordon, Ann D.; Collier-Thomas, Bettye (1997). "Introduction". African American women and the vote, 1837–1965. University of Massachusetts Press. pp. 2–9. ISBN 978-1-55849-059-8.
- Rebecca J. Mead, How the Vote Was Won: Woman Suffrage in the Western United States, 1868–1914 (2006)
- Glenda Riley, Inventing the American Woman: An Inclusive History (2001)
- "Suffragists Parade Down Fifth Avenue – 1917". New York Times. 1917.
- Aileen S. Kraditor, The Ideas of the Woman Suffrage Movement: 1890–1920 (1967)
- Katherine H. Adams and Michael L. Keene, Alice Paul and the American Suffrage Campaign (2007)
- Elizabeth Frost-Knappman and Kathryn Cullen-Dupont, Women's Suffrage in America (2004)
- Lynn Dumenil, The Modern Temper: American Culture and Society in the 1920s (1995) pp 98–144
- Kristi Andersen, After Suffrage: Women in Partisan and Electoral Politics before the New Deal (1996)
- Allan J. Lichtman (2000) . Prejudice and the Old Politics: The Presidential Election of 1928. Lexington Books. p. 163. ISBN 9780739101261.
- "Feature: World War I and isolationism, 1913–33". U.S. Department of State. April 29, 1991. Archived from the original on July 17, 2012.
- Rodney P. Carlisle (2009). Handbook to Life in America. Infobase Publishing. p. 245ff. ISBN 9781438119014.
- "Pandemics and Pandemic Scares in the 20th Century". U.S. Department of Health & Human Services. Archived from the original on July 21, 2011. Retrieved November 8, 2010.
- For a comprehensive history by a leading scholar see David M. Kennedy, Freedom from Fear: The American People in Depression and War, 1929–1945 (Oxford History of the United States) (2001)
- Shlaes 2008, pp. 85, 90
- David M. Kennedy, "What the New Deal Did," Political Science Quarterly, (Summer 2009) 124#2 pp 251–68
- Conrad Black, Roosevelt: Champion of Freedom (2003) pp 648–82
- Gordon W. Prange, Donald M. Goldstein and Katherine V. Dillon, At Dawn We Slept: The Untold Story of Pearl Harbor (1982)
- Harold G. Vatter, The U.S. Economy in World War II (1988) pp 27–31
- David Kennedy, Freedom from Fear: The American People in Depression and War, 1929–1945 (2001) pp 615–68
- David M. Kennedy, Freedom from Fear (1999) pp 615–68
- Roger Daniels, Prisoners Without Trial: Japanese Americans in World War II (2004)
- "Short History of Amache Japanese Internment Camp" (PDF).
- Ogawa, Dennis M. and Fox, Jr., Evarts C. Japanese Americans, from Relocation to Redress. 1991, page 135.
- Richey, Warren (December 5, 2007). "Key Guantánamo cases hit Supreme Court". The Christian Science Monitor.
- Richard Rhodes, The Making of the Atomic Bomb (1995)
- "Ralph Smith's eyewitness account of the Trinity trip to watch blast". White Sands Missile Range, Public Affairs Office. Archived from the original on September 4, 2014. Retrieved August 24, 2014.
- Stephen Ambrose, Eisenhower and Berlin, 1945: The Decision to Halt at the Elbe (2000)
- Ronald H. Spector, Eagle Against the Sun (1985) ch 12–18
- D. M. Giangreco, Hell to Pay: Operation DOWNFALL and the Invasion of Japan, 1945–1947 (2009)
- Richard B. Finn, Winners in Peace: MacArthur, Yoshida, and Postwar Japan (1992) pp 43–103
- Gaddis, John Lewis (1972). The United States and the Origins of the Cold War, 1941–1947. Columbia University Press. ISBN 978-0-231-12239-9.
- Leland, Anne; Oboroceanu, Mari–Jana (February 26, 2010). "American War and Military Operations Casualties: Lists and Statistics" (PDF). Congressional Research Service. Retrieved February 18, 2011. p. 2.
- John Lewis Gaddis, The Long Peace: Inquiries Into the History of the Cold War (1989)
- Blakeley, Ruth (2009). State Terrorism and Neoliberalism: The North in the South. Routledge. p. 92. ISBN 978-0415686174.
- John Lewis Gaddis, The Cold War: A New History (2005)
- William I Hitchcock (2018). The Age of Eisenhower: America and the World in the 1950s. Simon and Schuster. pp. xvi–xix. ISBN 9781451698428.
- Hitchcock (2018). The Age of Eisenhower. p. 109. ISBN 9781451698428.
- James T. Patterson, Grand Expectations: The United States, 1945–1974 (1988)
- Michael O'Brien, John F. Kennedy: A Biography (2005)
- Eric Alterman and Kevin Mattson, The Cause: The Fight for American Liberalism from Franklin Roosevelt to Barack Obama (2012)
- Robert Dallek, Lyndon B. Johnson: Portrait of a President (2004)
- Irving Bernstein, Guns or Butter: The Presidency of Lyndon Johnson (1994)
- David Edwin Harrell, Jr., Edwin S. Gaustad, John B. Boles, Sally Foreman Griffith, Randall M. Miller, Randall B. Woods, Unto a Good Land: A History of the American People (2005) pp 1052–53
- Gregory Schneider, The Conservative Century: From Reaction to Revolution (Rowman & Littlefield. 2009) ch 5
- Bruce J. Dierenfield, The Civil Rights Movement (2004)
- Lindsey Lupo (2010). Flak-Catchers: One Hundred Years of Riot Commission Politics in America. Lexington Books. pp. 123–24. ISBN 9780739138120.
- Joseph, Peniel E. (2001). "Black Liberation without Apology: Reconceptualizing the Black Power Movement". The Black Scholar. 31 (3–4): 2–19. doi: 10.1080/00064246.2001.11431152.
- Elizabeth Jacobs (2006). Mexican American Literature: The Politics of Identity. Routledge. p. 13. ISBN 9781134218233.
- Angela Howard Zophy, ed. Handbook of American Women's History (2nd ed. 2000).
- Donald T. Critchlow, Phyllis Schlafly and Grassroots Conservatism: A Woman's Crusade (2005)
- Jane J. Mansbridge, Why We Lost the ERA (1986)
- Donald T. Critchlow, Intended Consequences: Birth Control, Abortion, and the Federal Government in Modern America (2001)
- Roger Chapman, Culture Wars: An Encyclopedia of Issues, Voices, and Viewpoints (2009)
- John Robert Greene, The Presidency of Gerald R. Ford (1995)
- Martha Derthick, The Politics of Deregulation (1985)
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- "The United States Unemployment Rate". Miseryindex.us. November 8, 2008. Archived from the original on September 20, 2008. Retrieved January 31, 2010.
- Wilentz 2008, p. 170
- Julian E. Zelizer (2010). Arsenal of Democracy: The Politics of National Security—From World War II to the War on Terrorism. Basic Books. p. 350. ISBN 9780465015078.
- Ruud van Dijk; et al. (2013). Encyclopedia of the Cold War. Routledge. pp. 863–64. ISBN 978-1-135-92311-2.
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- Wilentz 2008, p. 400
- Theodore Caplow; Howard M. Bahr; Bruce A. Chadwick; John Modell (1994). Recent Social Trends in the United States, 1960–1990. McGill-Queen's Press. p. 337. ISBN 9780773512122.
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- National Commission on Terrorist Attacks, The 9/11 Commission Report (2004)
- David E. Sanger, Confront and Conceal: Obama's Secret Wars and Surprising Use of American Power (2012) ch 1, 5
- Julian E. Zelizer, ed. The Presidency of George W. Bush: A First Historical Assessment (2010) pp 59–87
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- "Guantanamo an ideal recruitment tool for terrorists – UN human rights chief". Retrieved October 1, 2014.
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- Wilentz 2008, p. 453
- William Crotty, "Policy and Politics: The Bush Administration and the 2008 Presidential Election," Polity (2009) 41#3 pp 282–311 doi: 10.1057/pol.2009.3
- NBC News, "'The war is over': Last US soldiers leave Iraq," MSNBC Dec. 18, 2011 Archived March 1, 2016, at the Wayback Machine
- Glenn Greenwald, "Obama's new executive order on Guantanamo: The president again bolsters the Bush detention regime he long railed against," Salon March 8, 2011
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- Thomas Payne, The Great Recession: What Happened (2012)
- * Rosenberg, Jerry M. (2012). The Concise Encyclopedia of The Great Recession 2007–2012. Scarecrow Press 2nd edition 708pp. ISBN 9780810883406.
- Robert W. Kolb (2011). The Financial Crisis of Our Time. Oxford University Press. p. 96ff. ISBN 9780199792788.
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- "'I'd Approve TARP Again': George W. Bush". November 5, 2010. Archived from the original on October 16, 2015.
- Steven Rattner, Overhaul: An Insider's Account of the Obama Administration's Emergency Rescue of the Auto Industry (2010)
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- CNBC (February 10, 2014). "US economy may be stuck in slow lane for long run". CNBC. Retrieved October 1, 2014.
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- Paul R. Abramson et al. Change and Continuity in the 2008 and 2010 Elections (2011)
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- Alexander, Ruth M. and Mary Beth Norton, Major Problems in American Women's History (4th ed. 2006)
- Beard, Charles A. and Mary Beard, The Rise of American civilization (2 vol. 1927), Complete edition online, highly influential in 1920s–1940s
- Carnes, Mark C., and John A. Garraty, The American Nation: A History of the United States (14th ed. 2015); university and AP textbook
- Hamby, Alonzo L. (2010). Outline of U.S. History. U.S. Department of State. Archived from the original on April 8, 2013.
- Divine, Robert A. et al. America Past and Present (10th ed. 2012), university textbook
- Foner, Eric. Give Me Liberty! An American History (4th ed. 2013), university textbook
- Gilbert, Martin. The Routledge Atlas of American History (2010)
- Kennedy, David M.; Cohen, Lizabeth (2016). The American Pageant: A History of the Republic (16th ed.). Boston: Houghton Mifflin., university textbook 12th edition 2002 online
- Schweikart, Larry, and Dave Dougherty. A Patriot's History of the Modern World, Vol. I: From America's Exceptional Ascent to the Atomic Bomb: 1898–1945; Vol. II: From the Cold War to the Age of Entitlement, 1945–2012 (2 vol. 2013), a view from the right
- Tindall, George B., and David E. Shi. America: A Narrative History (9th ed. 2012), university textbook
- Zinn, Howard (2003). A People's History of the United States. HarperPerennial Modern Classics. ISBN 9780060528423., a view from the left
- Agnew, Jean-Christophe, and Roy Rosenzweig, eds. A Companion to Post-1945 America (2006)
- Alden, John R. A history of the American Revolution (1966) 644pp online
- Bailey, Thomas A. A Diplomatic History of the American People (10th edition 1980) online free to borrow.
- Boehm, Lisa Krissoff, and Steven Hunt Corey. America's Urban History (2014); University textbook; see website
- Boyer, Paul, ed. The Oxford companion to United States history (2001) online
- The New Cambridge History of American Foreign Relations (4 vol 2013) online
- Chambers, John Whiteclay, ed. The Oxford Companion to American Military History (2000) online
- Diner, Hasia, ed. Encyclopedia of American Women's History (2010)
- Evans, Sara M. Born for Liberty: A History of Women in America (1997) excerpt and text search
- Fiege, Mark. The Republic of Nature: An Environmental History of the United States (2012) 584 pages
- Gerber, David A. American Immigration: A Very Short Introduction (2011)
- Goldfield, David. ed. Encyclopedia of American Urban History (2 vol 2006); 1056pp;
- Gray, Edward G. ed. The Oxford Handbook of the American Revolution (2012)
- Hitchcock, William I. The Age of Eisenhower: America and the World in the 1950s (Simon & Schuster, 2018). online review symposium
- Horton, James Oliver and Lois E. Horton. Hard Road to Freedom: The Story of African America (2 vol. 2002)
- Howe, Daniel Walker. What Hath God Wrought: The Transformation of America, 1815–1848 (Oxford History of the United States) (2009), Pulitzer Prize
- Hopkins, A. G. American Empire: A Global History (2018) excerpt
- Hornsby Jr., Alton. A Companion to African American History (2008)
- Johnson, Thomas H., ed. The Oxford companion to American history (1966) online
- Kammen, Michael G, ed. The Past before us: Contemporary historical writing in the United States (1980), wide-ranging survey of historiography; online free
- Kazin, Michael, et al. eds. The Concise Princeton Encyclopedia of American Political History (2011)
- Kennedy, David M. Freedom from Fear: The American People in Depression and War, 1929–1945 (Oxford History of the United States) (2001), Pulitzer Prize online
- Kirkendall, Richard S. A Global Power: America Since the Age of Roosevelt (2nd ed. 1980) university textbook 1945–80 online
- Kirkland, Edward C. A History Of American Economic Life (3rd ed. 1960) online
- Kurian, George T. ed. Encyclopedia of American Studies (4 vol. 2001).
- Lancaster, Bruce, Bruce Catton, and Thomas Fleming. The American Heritage History of the American Revolution (2004), very well illustrated
- Leuchtenburg, William E. The American President: From Teddy Roosevelt to Bill Clinton (2015), popular narrative by a leading scholar; 904 pp
- McPherson, James M. Battle Cry of Freedom: The Civil War Era (Oxford History of the United States) (2003), Pulitzer Prize; comprehensive coverage of 1848–1865
- Middleton, Richard, and Anne Lombard. Colonial America: A History to 1763 (4th ed. 2011)
- Milner, Clyde A., Carol A. O'Connor, and Martha A. Sandweiss, eds. The Oxford History of the American West (1996)
- Morris, Charles R. A Rabble of Dead Money: The Great Crash and the Global Depression: 1929–1939 (PublicAffairs, 2017), 389 pp. online review
- Nugent, Walter. Progressivism: A Very Short Introduction (2009)
- Patterson, James T. Grand Expectations: The United States, 1945–1974 (Oxford History of the United States) (1997)
- Patterson, James T. Restless Giant: The United States from Watergate to Bush v. Gore (Oxford History of the United States) (2007)
- Paxson, Frederic Logan. History of the American frontier, 1763–1893 (1924) online, old survey by leading authority; Pulitzer Prize
- Perry, Elisabeth Israels, and Karen Manners Smith, eds. The Gilded Age & Progressive Era: A Student Companion (2006)
- Pole, Jack P. and J.R. Pole. A Companion to the American Revolution (2003)
- Resch, John, ed. Americans at War: Society, Culture, and the Homefront (4 vol 2004), essays by experts on a wide range of homefront topics.
- Schlesinger, Arthur. Jr., ed. History of American Presidential Elections, 1789–2008 (2011) 3 vol and 11 vol editions; detailed analysis of each election, with primary documents; online v. 1. 1789–1824 – v. 2. 1824–1844 – v. 3. 1848–1868 – v. 4. 1872–1888 – v. 5. 1892–1908 – v. 6. 1912–1924 – v. 7. 1928–1940 – v. 8. 1944–1956 – v. 9. 1960–1968 – v. 10. 1972–1984 – v. 11. 1988–2001
- Sheehan-Dean, ed., Aaron (2014). A Companion to the U.S. Civil War. New York: Wiley Blackwell. ISBN 978-1-44-435131-6.CS1 maint: Extra text: authors list ( link), 2 vol. 1232pp; 64 topical chapters by experts; emphasis on historiography.
- Slotten, Hugh Richard, ed., The Oxford Encyclopedia of the History of American Science, Medicine, and Technology (2014), 1456 pp
- Taylor, Alan. Colonial America: A Very Short Introduction (2012) 168pp
- Taylor, Alan. American Colonies (2002), 526 pages; by a leading scholar
- Taylor, Alan. American Revolutions: A Continental History, 1750–1804 (2016) 704pp; recent survey by leading scholar
- Thernstrom, Stephan, ed. Harvard Encyclopedia of American Ethnic Groups (1980) online
- Schlesinger, Arthur. Jr., ed. History of American Presidential Elections, 1789–2008 (2011) 3 vol and 11 vol editions; detailed analysis of each election, with primary documents; online v. 1. 1789–1824 – v. 2. 1824–1844 – v. 3. 1848–1868 – v. 4. 1872–1888 – v. 5. 1892–1908 – v. 6. 1912–1924 – v. 7. 1928–1940 – v. 8. 1944–1956 – v. 9. 1960–1968 – v. 10. 1972–1984 – v. 11. 1988–2001
- Vickers, Daniel, ed. A Companion to Colonial America (2006)
- Wilentz, Sean (2008). The Age of Reagan: A History, 1974–2008.
- Wood, Gordon S. Empire of Liberty: A History of the Early Republic, 1789–1815 (Oxford History of the United States) (2009)
- Zophy, Angela Howard, ed. Handbook of American Women's History. (2nd ed. 2000). 763 pp. articles by experts online
- Commager, Henry Steele and Milton Cantor. Documents of American History Since 1898 (8th ed. 2 vol 1988)
- Engel, Jeffrey A. et al. eds. America in the World: A History in Documents from the War with Spain to the War on Terror (2014) 416pp with 200 primary sources, 1890s–2013
- Troy, Gil, and Arthur Schlesinger, Jr., eds. History of American Presidential Elections, 1789–2008 (2011) 3 vol; detailed analysis of each election, with primary documents
- Encyclopedia of American Studies, sophisticated short articles on a wide range of topics.
- US History map animation Animated map of the US, showing territorial expansion and statehood by year (Quick Maps, Theodora.com).
- US History map animation Animated map of the US, showing territorial expansion and statehood by year (Houston Institute for Culture).
- Edsitement, History & Social Studies, lesson plans from the National Endowment for the Humanities
- The Gilder Lehrman Institute of American History, includes curriculum modules covering the Revolution to the present
- BackStory, American history public radio show hosted by Ed Ayers, Brian Balogh, and Peter Onuf
- Early 20th century USA High Quality photographs
- Historical Hunt: U.S. History – Learning and Research