Final answer:
The US aimed to protect countries from Communism to maintain global stability, secure democratic ideals, and prevent Soviet influence from expanding, encapsulated by the Truman Doctrine and economic efforts like the Marshall Plan.
Step-by-step explanation:
The United States was committed to protecting other countries from being taken over by Communism during the Cold War to counter the spread of Soviet influence and to prevent the dominance of a communist ideology that was fundamentally opposed to the American ideals of democracy and free-market economics. This was a manifestation of the Truman Doctrine, which sought to support free nations against subjugation, viewing the spread of Communism as a threat to freedom and security.
Additionally, the US sought to expand its own influence by forming alliances and promoting economic prosperity through the Marshall Plan, which was essentially an investment in the economic health of Western Europe to prevent political instability and the appeal of Communist parties among the impoverished.