Plessy v. ferguson was one of the most important legal cases in american history. what impact did the supreme court's decision have on race relations in the u. s.? a. freed slaves were resettled in the north at government expense. b. jim crow laws in the south were upheld as constitutional. c. it struck down "separate but equal" because facilities for blacks were not equal with those for whites. d. "whites only" restaurants and hotels in the south were declared illegal.