The most significant goal of American foreign policy throught this entire time period was the goal of containing communism. This goal led to the most important actions that the US took in foreign policy during this time.
Almost immediately after the end of WWII, the US started trying to prevent the spread of communism. This was the main goal of US foreign policy at least through 1965. It led to such US actions as the following:
- The Marshall Plan
- The Truman Doctrine
- The Berlin Airlift
- The Korean War
- The overthrows of Mohammed Mossadegh in Iran and Jacobo Arbenz in Guatemala.
- The Bay of Pigs Invasion
- The Cuban Missile Crisis
- The Gulf of Tonkin Resolution
These constitute the most important actions that the US took in foreign policy during this time period. Each one was motivated by the desire to contain communism.