Which period of US foreign policy focused on the containment of the spread of communism in other nations?

The period of U.S. foreign policy that focused on the containment of communism is primarily known as the Cold War, which lasted from the late 1940s to the early 1990s. This strategy was articulated in the Truman Doctrine and implemented through various means, including military alliances like NATO, economic aid programs such as the Marshall Plan, and direct interventions in conflicts around the world, such as in Korea and Vietnam. The goal was to prevent the expansion of Soviet influence and the spread of communist ideology globally.