What best describes the situation where African-Americans used different facilities than other Americans?

The situation where African-Americans used different facilities than other Americans is best described by segregation. This term specifically refers to the enforced separation of different racial groups in various aspects of life, including schools, transportation, restrooms, and dining establishments. Segregation was a widespread practice in the United States, particularly in the Southern states, where laws mandated that African-Americans and white Americans occupy separate spaces.

Civil rights refers to the set of legal protections aimed at ensuring equal treatment and protection under the law for all citizens, particularly in the context of the efforts to end segregation and discrimination against African-Americans. Affirmative action is a policy designed to improve opportunities for historically marginalized groups often in areas like education and employment but does not directly describe the situation of using separate facilities. Integration denotes the process of bringing different racial groups together in public spaces, reversing the effects of segregation. Thus, the most accurate term to describe the situation is segregation.