Plessy vs 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. jim crow laws were upheld in the south as constitutional. b. freed slaves were resettled in in the north at government expense. c. "whites only" restaurants and hotels in the south were declared illegal. d. it struck down "separate but equal" because facilities for blacks were not equal with those for whites.