What supreme court upheld segregation or separate but equal?

The Supreme Court that upheld segregation and the doctrine of "separate but equal" was the one in the landmark case Plessy v. Ferguson in 1896. This ruling established that racial segregation was constitutional as long as the separate facilities for African Americans and whites were equal in quality. The decision legitimized state laws that enforced segregation for decades until it was eventually overturned by Brown v. Board of Education in 1954.