What was the policy created by President Truman to provide aid to countries threatened by Communism?

The Truman Doctrine was a pivotal policy established by President Harry S. Truman in 1947, aimed at providing support to countries that were at risk of falling under communist influence. This doctrine emerged in response to the geopolitical tensions of the Cold War era, specifically addressing the perceived threat of communism spreading from the Soviet Union to other nations.

The Truman Doctrine articulated the U.S. commitment to assist free peoples in their struggle against subjugation or external pressures, and it laid the groundwork for American foreign policy during this period. It marked a significant shift from isolationism to a more interventionist approach, emphasizing the United States' role in supporting democratic governments and resisting the spread of communism worldwide.

By defining the U.S. stance against communism in such explicit terms, Truman's policy set the stage for various forms of military and economic aid to countries in need, such as Greece and Turkey, which were facing internal struggles against communist movements.