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Why did President Truman dismiss General MacArthur in April 1951?

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Korean War, June–August 1950 — Korean War Map showing North Korean advances in the Korean War in June–August 1950.

President Harry S. Truman dismissed General Douglas MacArthur in April 1951 primarily due to the general's insubordination and his public opposition to the administration's policy of conducting a limited war.12

Following the intervention of Chinese forces in the Korean War, MacArthur advocated for expanding the conflict into China, which included the potential use of nuclear weapons. This stance directly challenged the president's authority over foreign policy and the administration's commitment to a strategy of containment, which sought to avoid a wider war that could expose Europe to attack.234

By publicly undermining the administration's efforts to negotiate a peace and declaring that there was "no substitute for victory," MacArthur forced Truman to act to uphold the essential democratic principle of civilian control over the military.34