Answer:
On June 27, 1950, President Harry S. Truman announces that he is ordering U.S. air and naval forces to South Korea to aid the democratic nation in repulsing an invasion by communist North Korea. The United States was undertaking the major military operation, he explained, to enforce a United Nations resolution calling for an end to hostilities, and to stem the spread of communism in Asia. In addition to ordering U.S. forces to Korea, Truman also deployed the U.S. 7th Fleet to Formosa (Taiwan) to guard against invasion by communist China and ordered an acceleration of military aid to French forces fighting communist guerrillas in Vietnam.
At the Yalta Conference towards the end of World War II, the United States, the USSR, and Great Britain agreed to divide Korea into two separate occupation zones. The country was split along the 38th parallel, with Soviet forces occupying the northern zone and Americans stationed in the south. In 1947, the United States and Great Britain called for free elections throughout Korea, but the Soviets refused to comply. In May 1948 the Korean Democratic People’s Republic–a communist state–was proclaimed in North Korea. In August, the democratic Republic of Korea was established in South Korea. By 1949, both the United States and the USSR had withdrawn the majority of their troops from the Korean Peninsula.
At dawn on June 25, 1950 (June 24 in the United States and Europe), 90,000 communist troops of the North Korean People’s Army invaded South Korea across the 38th parallel, catching the Republic of Korea’s forces completely off guard and throwing them into a hasty southern retreat. On the afternoon of June 25, the U.N. Security Council met in an emergency session and approved a U.S. resolution calling for an “immediate cessation of hostilities” and the withdrawal of North Korean forces to the 38th parallel. At the time, the USSR was boycotting the Security Council over the U.N.’s refusal to admit the People’s Republic of China and so missed its chance to veto this and other crucial U.N. resolutions.
On June 27, President Truman announced to the nation and the world that America would intervene in the Korean conflict in order to prevent the conquest of an independent nation by communism. Truman was suggesting that the USSR was behind the North Korean invasion, and in fact the Soviets had given tacit approval to the invasion, which was carried out with Soviet-made tanks and weapons. Despite the fear that U.S. intervention in Korea might lead to open warfare between the United States and Russia after years of “cold war,” Truman’s decision was met with overwhelming approval from Congress and the U.S. public. Truman did not ask for a declaration of war, but Congress voted to extend the draft and authorized Truman to call up reservists.
On June 28, the Security Council met again and in the continued absence of the Soviet Union passed a U.S. resolution approving the use of force against North Korea. On June 30, Truman agreed to send U.S. ground forces to Korea, and on July 7 the Security Council recommended that all U.N. forces sent to Korea be put under U.S. command. The next day, General Douglas MacArthur was named commander of all U.N. forces in Korea.
In the opening months of the war, the U.S.-led U.N. forces rapidly advanced against the North Koreans, but Chinese communist troops entered the fray in October, throwing the Allies into a hasty retreat. In April 1951, Truman relieved MacArthur of his command after he publicly threatened to bomb China in defiance of Truman’s stated war policy. Truman feared that an escalation of fighting with China would draw the Soviet Union into the Korean War.
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