Segregation was still widespread after World War II, especially in the American South where Jim Crow laws mandated separation of public facilities by race. In the 1940s-1950s, some institutions like professional sports and the military began integrating. The Supreme Court also started dismantling Jim Crow with rulings like Brown v. Board of Education in 1954, which declared racial segregation in public schools unconstitutional. This marked the beginning of a new era in the fight for civil rights in America.