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State governments of the United States are institutional units in the United States exercising some of the functions of government at a level below that of the federal government. Each state's government holds fiscal, legislative and executive authority over  a defined geographic territory. The United States comprises 50 states: 13 that were already part of the United States at the time the present Constitution took effect in 1789, plus 37 that have been admitted since by Congress as authorized under Article IV, Section 3 of the Constitution. 
While each state government within the United States holds legal and administrative jurisdiction within its bounds,  they are not sovereign in the Westphalian sense in international law which says that each State has sovereignty over its territory and domestic affairs, to the exclusion of all external powers, on the principle of non-interference in another State's domestic affairs, and that each State (no matter how large or small) is equal in international law.  Additionally, the member states of the United States do not possess international legal sovereignty, meaning that they are not recognized by other sovereign States such as, for example, France, Germany or the United Kingdom,  nor do they possess full interdependence sovereignty (a term popularized by international relations professor Stephen D. Krasner),  meaning that they cannot control movement of persons across state borders.  The idea of "dual sovereignty" or "separate sovereigns" is derived from the 10th Amendment to the Constitution, which states that "the powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people."  Structured in accordance with state law (including state constitutions and state statutes), state governments share the same structural model as the federal system, with three branches of government— executive, legislative, and judicial.
The governments of the 13 states that formed the original Union under the Constitution trace their roots back to the British royal charters which established them. Most of the states admitted to the Union after the original 13 have been formed from organized territories established and governed by Congress in accord with its plenary power under Article IV, Section 3, Clause 2 of the Constitution.  Six subsequent states were never an organized territory of the federal government, or part of one, before being admitted to the Union. Three were set off from an already existing state: Kentucky (1792, from Virginia),    Maine (1820, from Massachusetts),    and West Virginia (1863, from Virginia).    Two were sovereign states at the time of their admission: Texas (1845, previously the Republic of Texas),    and Vermont (1791, previously the Vermont Republic De facto).    One was established from unorganized territory: California (1850, from land ceded to the United States by Mexico in 1848 under the terms of the Treaty of Guadalupe Hidalgo).   
In the majority of states (26), the state legislature is simply called "Legislature." Another 19 states call their legislature "General Assembly". Two states ( Oregon and North Dakota) use the term "Legislative Assembly", while another two ( Massachusetts and New Hampshire) use the term "General Court".
In the 49 bicameral legislatures, the upper house is called the "Senate".
Until 1964, state senators were generally elected from districts that were not necessarily equal in population. In some cases state senate districts were based partly on county lines; in the vast majority of states the senate districts provided proportionately greater representation to rural areas. However, in the 1964 decision Reynolds v. Sims, the U.S. Supreme Court ruled that, unlike the United States Senate, state senates must be elected from districts of approximately equal population.
In 40 of the 49 bicameral state legislatures, the lower house is called the "House of Representatives". The name "House of Delegates" is used in Maryland, Virginia, and West Virginia. California and Wisconsin call their lower house the "State Assembly", while Nevada and New York simply call the lower house the "Assembly". New Jersey calls its lower house the "General Assembly".
The executive branch of every state is headed by an elected Governor. Most states have a plural executive, in which several key members of the executive branch are directly elected by the people and serve alongside the governor. These include the offices of lieutenant governor (often on a joint ticket with the governor) and attorney general, secretary of state, auditors (or comptrollers or controllers), treasurer, commissioner of agriculture, commissioner (or superintendent) of education, and commissioner of insurance.[ citation needed]
Each state government is free to organize its executive departments and agencies in any way it likes. This has resulted in substantial diversity among the states with regard to every aspect of how their governments are organized.
Most state governments traditionally use the department as the standard highest-level component of the executive branch, in that the secretary of a department is normally considered to be a member of the governor's cabinet and serves as the main interface between the governor and all agencies in his or her assigned portfolio. A department in turn usually consists of several divisions, offices, and/or agencies. A state government may also include various boards, commissions, councils, corporations, offices, or authorities, which may either be subordinate to an existing department or division, or independent altogether.
A few of the most populous or oldest states have run into serious administrative problems because they promoted too many important government functions from divisions to departments (usually in response to whatever was the biggest scandal at the time), thereby expanding the governor's cabinet to an unwieldy size. Rather than adopt the sensible (but politically radioactive) solution of demoting some departments back to divisions, those states created another level above departments and limited cabinet membership to the officers appointed at that level. California created "agencies" (also called "superagencies" by government insiders to distinguish them from the general usage of the term "agency"), Kentucky created "cabinets," Massachusetts created "executive offices," and Vermont created "agencies."[ citation needed]
The judicial branch in most states has a court of last resort usually called a supreme court that hears appeals from lower state courts. New York's highest court is called the Court of Appeals, while its trial court is known as the Supreme Court. Maryland also calls its highest court the Court of Appeals. Texas and Oklahoma each separate courts of last resort for civil and criminal appeals. Each state's court has the last word on issues of state law and can only be overruled by federal courts on issues of Constitutional law.
The structure of courts and the methods of selecting judges is determined by each state's constitution or legislature. Most states have at least one trial-level court and an intermediate appeals court from which only some cases are appealed to the highest court.
Although the exact position of each component may vary, there are certain components common to most state governments:
- Office of the Governor
- Office of the Lieutenant Governor
- Office of the State Attorney General
- Arts council
- Banking/ Financial institutions
- Civil service
- Consumer protection
- Corrections and parole supervision
- Economic development
- Emergency management
- Fire protection
- Health care
- Highway patrol
- Law revision
- Motor vehicles
- Military affairs (National Guard)/ Adjutant general
- Occupational safety and health
- Pensions (for public employees)
- Public health
- Secretary of state
- State parks
- State police
- State university system
- Unemployment insurance
- Veterans' affairs
- Workers' compensation
- List of people who have served in all three branches of a U.S. state government
- Local government in the United States
- Federal government of the United States
- Article Four of the United States Constitution
- Seals of the U.S. states
- Political divisions of the United States
- "Glossary of Statistical Terms: State Government". Organisation for Economic Cooperation and Development (OECD). Retrieved February 26, 2017.
- "Constitution of the United States, Article IV, Section 3, Paragraph 1". Legal Information Institute, Cornell University Law School. Retrieved 17 October 2015.
"Constitution of the United States, Amendment X". Legal Information Institute, Cornell University Law School. Retrieved 17 October 2015.
The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people.
- Krasner, Professor Stephen D. (2001). Problematic Sovereignty: Contested Rules and Political Possibilities. pp. 6–12. ISBN 9780231121798.
- Axtmann, Roland (2007). Democracy: Problems and Perspectives. Edinburgh: Edinburgh University Press. p. 136. ISBN 9780748620104. Retrieved 23 December 2015.
- Stein, Mark (2008). How the States Got Their Shapes. New York: HarperCollins. pp. xvi, 334. ISBN 9780061431395.
- "Official Name and Status History of the several States and U.S. Territories". TheGreenPapers.com.
- Michael P. Riccards, "Lincoln and the Political Question: The Creation of the State of West Virginia" Presidential Studies Quarterly, Vol. 27, 1997 online edition
- "A State of Convenience: The Creation of West Virginia, Chapter Twelve, Reorganized Government of Virginia Approves Separation". Wvculture.org. West Virginia Division of Culture and History.
- Holt, Michael F. (200). The fate of their country: politicians, slavery extension, and the coming of the Civil War. New York: Hill and Wang. p. 15. ISBN 978-0-8090-4439-9.
- "The 14th State". Vermont History Explorer. Vermont Historical Society.
- "California Admission Day September 9, 1850". CA.gov. California Department of Parks and Recreation.
- "Policy Basics: Where Do Our State Tax Dollars Go?". Center on Budget and Policy Priorities. 10 April 2009.