Racial segregation was common in the 19th century United States, separating whites and blacks in public spaces like schools, restaurants, and transportation. The 1954 Brown v. Board of Education Supreme Court decision ruled racial segregation in public schools unconstitutional. Prominent civil rights leaders like Martin Luther King Jr. and Rosa Parks protested segregation through nonviolent activism, helping to achieve greater legal equality and integration, though racial biases still persisted in society.