The plessy v. ferguson doctrine of ""separate but equal"" had permeated american society since the turn of the twentieth century. put in chronological order the u. s. supreme court cases that chiseled away at the court’s previous decision.

Using mr smith and his id, identify two potential internal validity threats that might affect the a—b design. tell me how that threat might impact conclusions in the a—b design. note #1: you cannot use maturation (since i already did that one for note #2: there are some mr smith id threats that won’t have much impact in a single case design.