4_The Korean War

The US Response

After World War Two, President Truman was determined to contain communism and stop it from spreading. He saw Korea as a test case for American credibility. To him, doing nothing would mean letting communism spread unchecked.

Source 1

“Korea is a symbol to the watching world. If we allow Korea to fall within the Soviet orbit, the world will feel we have lost another round in our match with the Soviet Union.”
— US State Department, 1950

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This source shows that the USA believed Korea symbolized the global struggle between communism and capitalism. Losing Korea would mean losing influence in the Cold War.

United Nations Resolution 84

Truman sent advisers, supplies, and warships but wanted UN support to legitimize intervention. The USSR, normally able to veto such moves, was boycotting the UN over China’s exclusion, so Resolution 84 passed easily. It allowed UN forces to push the North Koreans out of South Korea, though most troops were American under General MacArthur.

Paragraph:
Because the USSR was absent, the UN could act decisively. Truman gained international backing, turning what could have been a purely American intervention into a UN mission.

Source 2

“The UN will render such assistance to the Republic of Korea as may be necessary to restore international peace and security to the area.”
— UN Resolution 84, 1950

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This confirms the UN’s official goal: restoring peace in Korea, not invading the North. In practice, however, it became heavily influenced by U.S. policy.

Source 3

“If the UN cannot bring the crisis in Korea to an end then we might as well just wash up the United Nations and forget it.”
— Senator Tom Connally, 1950

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Connally’s statement highlights the belief that the UN’s credibility depended on its ability to act effectively in Korea.

Development

I. September 1950 – The UN Force Advances

UN forces landed at Inchon, while South Korean troops advanced from Pusan. Within weeks, North Koreans were pushed back beyond the 38th parallel.

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This marked the first major UN success. It seemed that the policy of containment had worked, with communists expelled from the South.

Source 4

A cartoon by David Low, 1950.
Caption: “In memory of the League of Nations – Died of Lack of Exercise – Facing Wanton Aggression”

Paragraph (Source Analysis):
The cartoon compares the League of Nations’ failure to act in the 1930s with the UN’s decisive intervention in Korea. It suggests that, unlike the League, the UN was finally taking real action against aggression.

II. October 1950 – The UN Force Presses On

After the North’s retreat, MacArthur pushed into North Korea despite Chinese warnings. By October, U.S. troops reached the Yalu River, the border with China. Truman and MacArthur began aiming beyond containment—to remove communism entirely from Korea.

Source 6

“Had they [the Chinese] intervened in the first or second months it would have been decisive... we are no longer fearful of their intervention.”
— General MacArthur, October 1950

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MacArthur’s overconfidence underestimated China’s military strength and commitment to defending its border.

III. November 1950 – The UN Force Retreats

Late in 1950, 200,000 Chinese “volunteers” attacked with modern Soviet-supplied equipment. The UN forces were driven back below the 38th parallel in harsh winter conditions.

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MacArthur’s misjudgment led to major UN losses. China’s intervention turned the war into a bloody stalemate.

IV. April 1951 – MacArthur Is Sacked

MacArthur wanted to invade China and even use nuclear weapons, but Truman refused, fearing world war. After MacArthur publicly challenged Truman’s authority, he was dismissed. Containment, not expansion, remained the official policy.

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Truman’s dismissal of MacArthur reaffirmed U.S. commitment to containment rather than global confrontation.

V. June 1951 – Peace Talks Begin

Fighting reached a stalemate around the 38th parallel, and peace talks began. However, combat continued for two years.

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The war had reached a deadlock. Neither side could claim victory, but communism was contained.

VI. July 1953 – Armistice

With Eisenhower as President and Stalin’s death reducing communist confidence, an armistice was signed. Korea’s border remained roughly the same as before 1950.

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The war ended without territorial change, but it confirmed the division of Korea that persists today.

Who Was General Douglas MacArthur (1880–1964)?

  • Born 1880, son of a decorated general.

  • Fought in WWI, youngest commander in France, won 13 medals.

  • Led Pacific campaign in WWII, developed “island-hopping” strategy.

  • Controlled postwar Japan (1945–1951), rebuilding the country.

  • Commanded UN forces in Korea (1950–1951).

  • Dismissed by Truman; later tried to run for president in 1952.

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MacArthur was a brilliant but arrogant general. His belief in total victory and his disregard for political limits led to his downfall.

Source 7

“Even the reports to the UN were censored by [American] state and defence departments. I had no connection with the United Nations whatsoever.”
— From General MacArthur’s memoirs.

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MacArthur claimed the Korean War was essentially an American operation under a UN label, reflecting U.S. dominance in decision-making.

Consequences of the Korean War

The casualties were enormous, especially among civilians. Military deaths were also high—American losses per year were greater than in Vietnam.

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The war caused massive destruction and loss of life. Although communism was contained, the price was immense for both Koreas.