in what case previous to this was it ruled that it was ok for black and white students to be “separate but equal”? when was this case ruled?

Question

Plessy v. Ferguson was a landmark 1896 U.S. Supreme Court decision that upheld the constitutionality of racial segregation under the “separate but equal” doctrine. The case stemmed from an 1892 incident in which African American train passenger Homer Plessy refused to sit in a car for Black people

“Separate but equal” refers to the infamously racist decision by the U.S. Supreme Court in Plessy v. 

The decision declared that separate educational facilities for white and African American students were inherently unequal.