School segregation in the United States was the segregation of students in educational facilities based on their race and ethnicity. While not prohibited from having or attending schools, various minorities were barred from most schools that admitted white students. Segregation was enforced by laws inU.S. states, primarily in the Southern United States, although segregation could also occur in informal systems or through social expectations and norms in other areas of the country. Segregation laws were met with resistance by Civil Rights activists and began to be challenged in the 1930s in cases that eventually reached the U.S. Supreme Court.
Segregation continued longstanding exclusionary policies in much of the Southern United States (where most African Americans lived) after the Civil War. Jim Crow laws codified segregation. These laws were influenced by the history of slavery and discrimination in the US. Secondary schools for African Americans in the South were called training schools instead of high schools in order to appease racist whites and focused on vocational education. School integration in the United States took place at different times in different areas and often met resistance. After the ruling of Brown v. Board of Education in 1954, which invalidated segregated-schooling laws, school segregation took de facto form. School segregation declined rapidly during the late 1960s and early 1970s as the government became strict on schools' plans to combat segregation more effectively as a result of Green v. County School Board of New Kent County. Voluntary segregation by income appears to have increased since 1990.