The Truman Doctrine shifted U.S. foreign policy away from isolationism towards supporting freedom and resisting communism.
The Truman Doctrine marked a significant departure from previous American foreign policy by turning away from its policy of isolationism. It was a declaration by President Truman in 1947 that the United States would support free peoples resisting communism. This new approach led to the United States providing military aid to countries like Greece and Turkey to prevent the spread of Communism.
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