What 1947 US policy aimed to contain communism after World War II?

The 1947 U.S. policy aimed at containing communism after World War II was the Truman Doctrine.

President Harry S. Truman announced the doctrine in a speech to Congress on March 12, 1947. He asked for aid to Greece and Turkey, arguing that the United States should support free peoples resisting pressure from authoritarian or communist movements. Congress approved $400 million in assistance.

The doctrine marked a major break from America’s traditional reluctance to become deeply involved in conflicts beyond the Western Hemisphere. It became an important foundation of Cold War containment, the broader strategy of limiting Soviet expansion rather than attempting to overthrow communism everywhere.

A common mix-up is the Marshall Plan. Announced later in 1947, it focused primarily on rebuilding European economies, although it also helped resist communist influence. The Eisenhower Doctrine came in 1957 and applied similar anti-communist principles especially to the Middle East.