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Discrimination is the act of someone being prejudice towards another . This term is used to highlight the difference in treatment between members of different groups when one group is intentionally singled out and treated worse, or not given the same opportunities. As attitudes toward minorities started to change, the term discrimination began to refer to that issue. Over the years, many forms of discrimination have come to be recognized including nationalist , Race (human categorization), gender, and Sexual orientation throughout US history, especially after the Civil War.
Colorism in America first came about during slavery. Lighter skinned slaves tend to work indoors, while dark skinned worked outdoors. In 1865, during the Reconstruction period after the Civil War, the Thirteenth Amendment to the United States Constitution was passed and it abolished slavery. This was soon followed by the Fourteenth Amendment to the United States Constitution that granted citizenship to all persons "born or naturalized in the United States", and the Fifteenth Amendment to the United States Constitution that protected the rights to vote for everyone. These Amendments passed during the Reconstruction period extended protection to the newly emancipated slaves. However, in the 1870s Jim Crow laws were introduced in the Southeastern United States. These laws promoted the idea of "Separate but equal"  which was first brought about from the Plessy v. Ferguson in 1896, meaning that all races were equal, but they had to have separate public facilities. The mixing of races was illegal in most places such as public schools, public transportation and restaurants . These laws increased discrimination and segregation in the United States. Often times, the products and sections designated for the "Colored" were inferior and not as nice for the "White Only" . Water fountains, bathrooms, and park benches were just a few of the areas segregated by Caucasians due to Jim Crow laws. Furthermore, the Jim Crow laws systematically made life harder for African-Americans and people of color. It made voting harder to accomplish, due to the fact that African-Americans had to do literacy tests and go through other obstacles before getting the chance to vote.
In the modern United States, gay black men are extremely likely to experience intersectional discrimination. In the United States, the children of gay African-American men have a poverty rate of 52 percent, the highest in the country. Gay African-American men in partnerships are also six times more likely to live in poverty than gay white male couples. 
Major figures such as Martin Luther King Jr., Malcolm X, and Rosa Parks  were involved in the fight against the race-based discrimination of the Civil Rights Movement. Rosa Parks's refusal to give up her bus seat in 1955 sparked the Montgomery bus boycott—a large movement in Montgomery, Alabama that was an integral period at the beginning of the Civil Rights Movement. The Bus Boycott lasted a total of 381 days before the Supreme Court deemed that segregated seating is unconstitutional. Dr. Martin Luther King Jr., a peaceful activist and pastor, led many such protests, advocating for the improvement of African-Americans in American's society. His role in the Montgomery Bus Boycott helped to launch his role in the Civil Rights Movement. King organized many protests attended not only by African-American, but also Caucasians.
While King  organized peaceful protests, Malcolm X went a different route. His main supporters, The Nation of Islam, and him stressed the idea of black power, and black pride. Although Malcolm X's actions were radical, especially when they contradicted that of Dr. King, but he is still considered one of the pioneers in fighting back against racial discrimination in daily life and not just from a political standpoint. His ideas of black nationalism and the use of violence to fight back helped to spark the political group in the Black Panther Party for Self-Defense, which later became known as the Black Panther Party. Formed by Bobby Seale and Huey P. Newton, the organization was created in October of 1966 in Oakland, California. Usually seen in all black and armed, as a group, the Black Panthers first started off patrolling police activity in Oakland, but soon grew to widespread support in cities like Los Angeles, and Chicago. Although they were seen as a violent gang and a danger to society, the Black Panthers brought numerous social programs such as free breakfast for school children and free clinics across numerous cities. What the Black Panthers were fighting for was outlined in their Ten Point Program. They were ultimately taken down by the FBI, led by J. Edgar Hoover, in the early 1970s. Other factors such as internal tensions, and financial struggles also played into the demise of the Black Panther Party and by 1982 they were completely gone .
In the education system, the Civil Rights Movement further became huge after the ruling of Brown v. Board of Education in 1954. Oliver Brown challenged the Board of Education of Topeka, Kanas when his daughter was not allowed to enroll in any of the all white schools claiming that "separate but equal" violates the protection clause of the Fourteenth Amendment. Ruby Bridges, along with the Little Rock Nine, dealt with discrimination from Caucasian peers, their parents, and the community in general during the desegregation of schools. The Little Rock Nine were a group of nine African-American students who volunteered to attend school at the Central High School in Little Rock, Arkansas. They continuously had problems with the public and faced harsh treatment from other students, parents, and even the Little Rock National Guard. However, a change occurred when President Dwight D. Eisenhower intervened by sending federal troops to escort the students . For Ruby Bridges, she joined the Civil Rights Movement in the November 14, 1960 when she became enrolled in William Frantz Elementary School. Due to many parents not allowing their children in her class, Bridges was in class by herself, which was taught by Barbara Henry, and often times ate alone and had recess alone. Ruby, along with her family, did face a lot of backlash throughout Louisiana from the desegregation; however, they did receive support from numerous people in the North and Bridges was able to finish the year .
Gender discrimination is another form of discrimination. Women are often seen as an expense to their employers because they take days off for children, need time off for maternity leave and are stereotyped as "more emotional". The theory that goes hand in hand with this is known as the glass escalator  or the glass ceiling, which holds that while women are being held down in male-dominated professions, men often rise quickly to positions of authority in certain fields. Men are pushed forward into management, even surpassing women who have been at the job longer and have more experience in the field.
Men's rights deals with discrimination against men in the areas of family law, such as divorce and child custody, labor such as paternity leave, paternity fraud, health, education, conscription, and other areas of the law such as domestic violence, genital integrity, and allegations of rape.
Immigrants to the United States are affected by a totally separate type of discrimination. Some people feel as though the large numbers of people being allowed into the country are cause for alarm, therefore discriminate against them. 
Arizona recently passed a law that forces people to carry documents with them at all times to prove their citizenship. This is only one controversy over immigrants in the United States, another is the claim that immigrants are stealing "true Americans'" jobs.Immigration restrictions are among the biggest government interventions in the economy. They prevent millions of people from taking jobs, renting homes, and pursuing a wide range of opportunities that they could otherwise have.  Violent hate crimes have increased  drastically. Recent social psychological research suggests that this form of prejudice against migrants may be partly explained by some fairly basic cognitive processes.  
According to Soylu,  some argue that immigrants constantly face being discriminated against because of the color of their skin, the sound of their voice, the way they look and their beliefs. Many immigrants are well educated, some argue that they are often blamed and persecuted for the ills in society such as overcrowding of schools, disease and unwanted changes in the host country's culture due to the beliefs of this "unwelcomed" group of people. 
According to Soylu, there was an open immigration policy up until 1924 in America until the National Origins Act came into effect.  According to the Immigration Act of 1924 which is a United States federal law, it limited the annual number of immigrants who could be admitted from any country to 2% of the number of people from that country who were already living in the United States in 1890, down from the 3% cap set by the Immigration Restriction Act of 1921, according to the Census of 1890 It superseded the 1921 Emergency Quota Act. The law was primarily aimed at further restricting immigration of Southern Europeans and Eastern Europeans. According to Buchanan, later in the 1930s with the advent of opinion polling, immigration policy analysis was carried out by collecting public thoughts and opinions on the issue. These factors encouraged a heated debate on immigration policy. These debates continued even into the 2000s, and were intensified by George W. Bush's immigration proposal.  Some argue that the 9/11 terrorist attacks left the country in a state of paranoia and fear that strengthened the views in favor of having closed borders. 
Immigration to the United States can be difficult due to immigrants' lack of access to legal documents and the expensive nature of immigration. The United States has historically been a major target destination for people seeking work and continues to be so today.. As Graciela, a 47-year-old married woman who had lived in the US for 4 years, stated, “My husband,…he lost his job. Things were beginning to get tough…We came with the need to find work and better life possibilities.”   Worldwide, the workforce has become increasingly pluralistic and ethnically diverse as more and more people migrate across nations. Although race- or ethnicity-based discriminatory employment practices are prohibited in most developed countries, according to feminist scholar Mary Harcourt, actual discrimination is still widespread.  Sahagian Jacqueline, an author, argues that one example of this act of discrimination occurred at Macy's a department store. According to the U.S. Justice Department, Macy's used unfair documentation practices against legal immigrant employees who had proper work authorizations. During an eligibility re-verification process, Macy's broke immigration law that prohibits employers from discriminating against immigrant employees during re-verification by asking for more or different documents than other employees are required to submit based on a worker's immigration status or national origin. Some of the affected employees lost seniority, were suspended, or even let go due to the illegal re-verification.  While their opinions are controversial, researchers Moran, Tyler and Daranee argue that with immigrants' growing numbers and their expanding economic role in U.S. society, addressing challenges and creating opportunities for immigrants to succeed in the labor force are critical prerequisites to improve the economic security for all low-wage working families and ensure the future vitality of our economy. 
Another type of discrimination is that against lesbian, gay, bisexual, and transgender individuals. For personal reasons such as religious beliefs, employers sometimes choose to not hire these people. LGBT rights have been protested against for various reasons; for example, one topic of controversy related to LGBT people is marriage, which was legalized in all states in June 2015 following the Supreme Court case Obergefell v. Hodges.
- Age discrimination in the United States
- Black flight
- Civil Rights
- Civil Union
- Employment discrimination in the United States
- Housing discrimination in the United States
- Housing segregation
- Mortgage discrimination
- Racial inequality in the United States
- Racial steering
- Religious discrimination in the United States
- White flight
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