What did the ruling of Plessy v Ferguson say about segregation?

The ruling in Plessy v. Ferguson (1896) upheld the constitutionality of racial segregation under the "separate but equal" doctrine. The Supreme Court concluded that state laws requiring racial segregation in public facilities did not violate the Equal Protection Clause of the Fourteenth Amendment, as long as the separate facilities were deemed equal. This decision effectively legalized segregation and reinforced systemic racial discrimination in the United States for decades.