The "separate but equal" doctrine was established when the U. S. Supreme Court ruled in the case of .

Plessy v. Ferguson

Explanation:

Plessy v. Ferguson is a legal case in May 18, 1896 in which the U.S. Supreme Court put forward the “separate but equal” that questioned and consequently assessed the constitutionality of racial segregation laws. This case Plessy v. Ferguson assessed the Fourteenth Amendment(1868) equal protection clause that made state laws denying equal protection for black people and white people. It consequently sanctioned all laws that promoted racial segregation by way of unequal treatment of black and white people such as use of separate facilities.

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