The containment strategy was a foreign policy approach used primarily by the United States during the Cold War. Its main goal was to prevent the spread of communism beyond the countries where it already existed. This strategy involved various methods, including military alliances, economic aid, and diplomatic efforts to support nations resisting Soviet influence. Key events that exemplified the containment strategy include the Truman Doctrine, which provided support to countries threatened by communism, and the Marshall Plan, which aimed to rebuild European economies after World War II. Overall, containment shaped U.S. interactions with other nations during this tense period in history.