Truman's Containment Policy was a strategic approach adopted by the United States during the early Cold War aimed at preventing the spread of communism beyond where it already existed. This policy was grounded in the belief that if communism could be contained within its existing borders, it would eventually collapse under its own weight, thereby safeguarding democratic nations and the global balance of power. It shaped American foreign policy from the late 1940s through the early 1980s, influencing various military and diplomatic actions throughout this tense period.