June 19, 1961
In 1897, the Supreme Court applied to the states the Fifth Amendment's protection against the taking of property without just compensation, and in 1925, it did so with respect to the First Amendment's guarantee of the right to freedom of speech. In Mapp v. Ohio, the Court made a similar holding regarding the Fourth Amendment's protection against unreasaonable search and seizure, ruling that evidence obtained through an illegal search could not be admitted into evidence in a state court and thereby applying the exclusionary rule to the states for the first time.
View the timeline: Cases That Shaped the Federal Courts