How was the truman doctrine a departure from previous united states foreign policy?

Previously, the United States had a strict isolationist attitude. They did not want to get involved in any foreign conflicts they didn't have to.

However, as the communist Soviet Union rose, and the rush from the U.S. to spread democracy and stop communism started, America turned away from its isolationist attitude and started getting their hands in all different places.

The Truman Doctrine aimed to aid nations (especially those war torn by WWII) where the spread of communism was imminent.

- "schenck v. united states, case in which the u.s. supreme court ruled on march 3, 1919, that the freedom of speech protection afforded in the u.s. constitution's first amendment could be restricted if the words spoken or printed represented to society a “clear and present danger.” "

- speech aimed to potentially create danger could be banned.

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