13. The Supreme Court case Plessy v. Ferguson (1896): A) Ended segregation in schools. B) Legalized racial segregation under the "separate but equal" doctrine. C) Declared poll taxes unconstitutional. D) Upheld the Chinese Exclusior Act.

The correct answer is:<br /><br />B) Legalized racial segregation under the "separate but equal" doctrine.<br /><br />The Supreme Court case Plessy v. Ferguson (1896) upheld state laws requiring racial segregation in public facilities under the doctrine of "separate but equal." This decision effectively legalized racial segregation and was not overturned until the Brown v. Board of Education decision in 1954.