The supreme couty decision in plessy v. ferguson (1896) affected african america by

"separated but equal"

Plessy v. Ferguson, 163 U. S. 537 (1896), was a landmark decision of the U. S. Supreme Court issued in 1896. It upheld the constitutionality of racial segregation laws for public facilities as long as the segregated facilities were equal in quality - a doctrine that came to be known as "separate but equal".