Trumans cold war efforts at containment communism became known as?

Truman's Cold War efforts at containing communism became known as the "Truman Doctrine." Announced in 1947, this policy aimed to support countries resisting communist influence, particularly through economic and military aid. It marked a significant shift in U.S. foreign policy, committing the nation to a proactive stance against the spread of communism worldwide. This doctrine laid the groundwork for various subsequent initiatives, including the Marshall Plan and NATO.