In 1954, the United States Supreme Court's ruling in Brown v. Board of Education Topeka (347 U.S. 483) overturned the prevailing doctrine of separate but equal introduced by Plessy v. Ferguson (163 U.S. 537) fifty-eight years prior. By the time Brown was decided, many states had created dual collegiate structures of public education, most of which operated exclusively for Caucasians in one system and African Americans in the other.