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How did President Truman's containment policies lead to the Korean War and eventually Vietnam being America's longest war?

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A major aspect of the Truman Doctrine, which was announced and implemented after the end of World War II, was the policy of containment. Truman believed that to keep a balance of power, maintain stability in international politics, foster democracy, and impede totalitarian states, it was imperative that communism be held back, or contained.

Truman announced his policy on March 12, 1947, in a speech to a joint session of Congress. The immediate impetus was to provide aid to the Greek government, which was fighting a civil war against the Greek Communist Party. However, Truman's containment policy also caused the United States to support the French administration in Indochina in light of Ho Chi Minh's declaration of independence of Vietnam from France. The US administration was concerned that a communist victory in Vietnam would cause communism to spread throughout Southeast Asia. This began the US involvement in the conflict in Vietnam, which would not end until the last evacuation of US...

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