Which policy announced by President Truman in 1947 pledged the US to aid countries threatened by communist revolutions?

• A. Containment Policy
• B. Truman Doctrine
• C. Marshall Plan
• D. Domino Theory

Answer: (B)

This question tests understanding of the Truman Doctrine. In 1947, President Truman pledged that the United States would aid countries threatened by communist revolutions or subjugation, starting with Greece and Turkey, to prevent the spread of communism. That explicit commitment to provide economic and military aid to free peoples facing subversion is what defines the Truman Doctrine and marks the U.S. move into active containment of Soviet influence. The Containment Policy is related but broader and not the single pledge announced in 1947. The Marshall Plan came a year later and focused on rebuilding Western Europe, not specifically aiding nations under threat from communism. The Domino Theory is a rationale used to justify intervention, not the name of the policy announced by Truman.