Desegregation is the process of ending the separation of two groups, usually referring to races. Desegregation is typically measured by the index of dissimilarity, allowing researchers to determine whether desegregation efforts are having impact on the settlement patterns of various groups. This is most commonly used in reference to the United States. Desegregation was long a focus of the American civil rights movement, both before and after the US Supreme Court's decision in Brown v. Board of Education, particularly desegregation of the school systems and the military. Racial integration of society was a closely related goal.

The civil rights movement (1896–1954) was a long, primarily nonviolent action to bring full civil rights and equality under the law to all Americans. The era has had a lasting impact on American society – in its tactics, the increased social and legal acceptance of civil rights, and in its exposure of the prevalence and cost of racism.