What was the Truman Doctrine and how did it shape US foreign policy during the Cold War?

What was the Truman Doctrine and how did it shape US foreign policy during the Cold War?

The Truman Doctrine was a policy announced by President Harry S. Truman in 1947. It aimed to contain the spread of communism and provide economic and military assistance to countries threatened by communist expansion. The doctrine marked a shift in US foreign policy, as it committed the United States to actively opposing communism worldwide. It shaped US foreign policy during the Cold War by establishing the principle of containment, which guided US actions to prevent the spread of communism and led to increased military interventions, such as the Korean War and the Vietnam War. Additionally, the Truman Doctrine laid the foundation for the Marshall Plan, which provided economic aid to help rebuild war-torn Europe and strengthen democratic governments, further solidifying the United States' role as a global superpower.