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How did President Harry S. Truman respond to North Korea’s invasion?
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Korean War
Map showing North Korean advances in the Korean War in June–August 1950.
President Harry S. Truman viewed the North Korean invasion of South Korea as a critical test of the policy of containment and collective security. His response was characterized by swift action, though he notably did not seek a formal declaration of war from Congress, a decision that drew criticism at the time.123
Key aspects of his response included:
- Military Intervention: On June 27, 1950, Truman ordered U.S. air and naval forces to resist the invasion. By June 30, he authorized the deployment of U.S. ground forces from Japan to Korea.4
- UN Coordination: Truman secured United Nations sanction for the intervention. The UN Security Council condemned the invasion and called upon member nations to assist in restoring peace.41
- Command Structure: He appointed General Douglas MacArthur as the commander of the unified UN forces.42
- Strategic Escalation: Following the success of the Inchon landing, Truman authorized UN forces to advance into North Korea to destroy the North Korean armed forces and pursue the unification of the peninsula.41
- Civilian Control: When General MacArthur later insisted on expanding the war into China and using nuclear weapons, Truman removed him from command, asserting the principle of civilian control over the military.12