Harry S. Truman (May 8, 1884 - December 26, 1972) was an American statesman who served as the 33rd President of the United States (1945-1953), taking the office upon the death of Franklin D. Roosevelt. A World War I veteran, he assumed the presidency during the waning months of World War II and the beginning of the Cold War. He is known for implementing the Marshall Plan to rebuild the economy of Western Europe, for the establishment of the Truman Doctrine and NATO against Soviet and Chinese Communism, and for intervening in the Korean War. In domestic affairs, he was a moderate Democrat whose liberal proposals were a continuation of Franklin Roosevelt's New Deal, but the conservative-dominated Congress blocked most of them.

The escalation of the Cold War was highlighted by Truman's approval of NSC 68, a secret statement of foreign policy. It called for tripling the defense budget, and the globalization and militarization of containment policy whereby the U.S. and its NATO allies would respond militarily to actual Soviet expansion. The document was drafted by Paul Nitze, who consulted State and Defense officials; it was formally approved by President Truman as official national strategy after the war began in Korea. It called for partial mobilization of the U.S. economy to build armaments faster than the Soviets. The plan called for strengthening Europe, weakening the Soviet Union, and building up the U.S. both militarily and economically.  Early in Truman's second term, his former Secretary of Defense Forrestal died soon after retiring. Forrestal had become exhausted through years of hard labor during and after the war, and had begun to suffer depression. He retired in March 1949; soon after, he was hospitalized but committed suicide in May.  Truman was a strong supporter of the North Atlantic Treaty Organization (NATO), which established a formal peacetime military alliance with Canada and democratic European nations that had not fallen under Soviet control following World War II. The treaty establishing it was widely popular and easily passed the Senate in 1949; Truman appointed General Eisenhower as commander. NATO's goals were to contain Soviet expansion in Europe and to send a clear message to communist leaders that the world's democracies were willing and able to build new security structures in support of democratic ideals. The U.S., Britain, France, Italy, the Netherlands, Belgium, Luxembourg, Norway, Denmark, Portugal, Iceland, and Canada were the original treaty signatories. The alliance resulted in the Soviets establishing a similar alliance, called the Warsaw Pact.  General Marshall was Truman's principal adviser on foreign policy matters, influencing such decisions as the U.S. choice against offering direct military aid to Chiang Kai-shek and his Nationalist Chinese forces in the Chinese Civil War against their communist opponents. Marshall's opinion was contrary to the counsel of almost all of Truman's other advisers--Marshall thought propping up Chiang's forces would drain U.S. resources that were needed in Europe to deter the Soviets. When the communists took control of the mainland, establishing the People's Republic of China and driving the Nationalists to Taiwan, Truman would have been willing to maintain some relationship between the U.S. and the new government but Mao was unwilling. On June 27, 1950, after the outbreak of fighting in Korea, Truman ordered the U.S. Navy's Seventh Fleet into the Taiwan Strait to prevent further conflict between the communist government on the China mainland and the Republic of China (ROC) on Taiwan.

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