Which statement explains why the warren supreme court overturned the 1896 ruling in plessy v. ferguson? the plessy ruling allowed segregation which the warren court declared treated whites and blacks differently. the plessy ruling blocked voting rights for african americans which the warren court declared violated the fifteenth amendment. the plessy ruling took away states' rights which the warren court stated was central to the federal system in the united states. the plessy ruling blocked the use of civil disobedience which the warren court recognized was central to the success of the civil rights movement.