In what landmark case was the U.S.Constitution interpreted to protect freedom of speech from abridgment by state and local governments?

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Gitlow v. New York was a landmark case in which the U.S. Supreme Court ruled that the First Amendment's protection of freedom of speech applied to the states through the due process clause of the Fourteenth Amendment. This decision paved the way for future cases that continued to apply the Bill of Rights to state and local governments through the incorporation doctrine.

In What Landmark Case Was the U