1) Homer Plessy, who was 1/8 black, was arrested for sitting in the white section of a train in Louisiana in violation of state law. 2) The case went to the Supreme Court after Plessy argued the Separate Car Act violated the 13th and 14th Amendments. 3) The Supreme Court ultimately ruled against Plessy, upholding the Separate Car Act and establishing the "separate but equal" doctrine of racial segregation.