Prior to the enactment of the Thirteenth, Fourteenth, and Fifteenth Amendments to the U. S. Constitution, the U.S. Supreme Court rendered several decisions on the issue of slavery. After the enactment of constitutional amendments, the Supreme Court decided civil rights cases, in which the court restricted considerably the power of Congress to proscribe discrimination by operators of public accommodations.
The United States abolished slavery in the United States when it ratified the Thirteenth Amendment in 1865. The Fourteenth Amendment to the United States prohibits government from denying equal protection of the laws or due process of law to the citizens of the United States. The Fifteenth Amendment ratified in 1870 guaranteed all citizens the right to vote.