Korean War

Division and Invasion

North Korean forces crossed the 38th parallel on June 25, 1950, beginning a war that devastated the Korean peninsula and brought American and Chinese forces into direct combat. Korea’s division followed the defeat of Japan in 1945, when Soviet troops accepted the Japanese surrender in the north and American troops did so in the south. Rival governments emerged under Kim Il Sung and Syngman Rhee, each claiming authority over the whole country. [1]

Kim sought support from Joseph Stalin and Mao Zedong before attacking. Soviet correspondence records Stalin’s approval in May 1950, conditional on agreement between the Chinese and North Korean leaders. After the invasion, the United Nations Security Council condemned North Korea’s action. The Soviet representative was boycotting the Council over China’s representation and could not veto the resolutions. President Harry S. Truman committed American forces, which became the largest foreign contingent in a coalition operating under United Nations Command. [2] [1]

A War That Crossed the Peninsula

The initial North Korean advance pushed South Korean and allied troops into a defensive perimeter around Pusan. General Douglas MacArthur’s landing at Inchon in September 1950 and an advance from the perimeter reversed the campaign. United Nations forces retook Seoul, crossed the 38th parallel, and captured Pyongyang. Their objective had expanded from defending South Korea to defeating the northern government. [3]

Chinese forces entered the fighting in late 1950 and drove the coalition southward; Seoul changed hands again before United Nations forces recovered it in March 1951. Truman dismissed MacArthur in April after the general publicly challenged the administration’s conduct of the war. By midyear, neither coalition could impose unification without accepting the risks and costs of further escalation. Negotiations began while fighting continued along a front near the original division. [3]

Armistice and Continuing Division

Talks lasted two years, with the return of prisoners among the most difficult questions. On July 27, 1953, the United Nations Command, the Korean People’s Army, and the Chinese People’s Volunteers concluded an armistice. It stopped hostilities, established a demilitarized zone, and created machinery to supervise the truce. The agreement was military in character and anticipated a later peaceful settlement; it was not a peace treaty. Millions of soldiers and civilians had died. [4]

The war consolidated American security commitments in East Asia. Washington and Seoul signed a mutual defense treaty in 1953, and Japan’s role as a base and supplier accelerated its recovery and integration into the American alliance system. The peninsula remained divided, with rival governments and substantial military forces on both sides. The diplomatic disputes behind the ceasefire are treated separately in Negotiating During the Korean War. [5]

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