Was Plessy v Ferguson a federal or state case?

Answer 1

Plessy v. Ferguson, 163 US 537 (1896)

Both. Plessy v. Ferguson began in Louisiana state courts because it involved violation of the Louisiana Separate Car Act of 1890 (Act 111); however, the case was appealed to the US Supreme Court on a federal questionchallenging the constitutionality of the state law.

Answer 2

Plessy v Ferguson was a federal case that reached the United States Supreme Court. It involved a challenge to a Louisiana state law that required separate railroad cars for black and white passengers. The Supreme Court's decision in Plessy v Ferguson in 1896 established the "separate but equal" doctrine, which allowed racial segregation.