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The domino theory was a theory prominent from the 1950s to the 1980s, that speculated that if one country in a region came under the influence of communism, then the surrounding countries would follow in a domino effect. The domino theory was used by successive United States administrations during the Cold War to justify the need for American intervention around the world. Though he never directly used the term "domino theory", U.S. President Dwight D. Eisenhower put the theory into words during an April 7, 1954 news conference, when referring to communism in Indochina: ==History== In 1945, the Soviet Union brought most of the countries of Eastern Europe and Central Europe into its influence as part of the post-World War II new settlement, prompting Winston Churchill to declare in a speech in 1946 at Westminster College in Fulton, Missouri that: Following the Iran crisis of 1946, Harry S. Truman declared what became known as the Truman Doctrine in 1947, promising to contribute financial aid to Greece during their Civil War and to Turkey following World War II, in the hope that this would impede the advancement of Communism into Western Europe.〔(【引用サイトリンク】 title =The Truman Doctrine, 1947 )〕 Later that year, diplomat George Kennan wrote an article in ''Foreign Affairs'' magazine that became known as the "X Article", which first articulated the policy of containment,〔(【引用サイトリンク】 title =Kennan and Containment, 1947 )〕 arguing that the further spread of Communism to countries outside a "buffer zone" around the USSR, even if it happened via democratic elections, was unacceptable and a threat to U.S. national security. Kennan was also involved, along with others in the Truman administration, in creating the Marshall Plan, which also began in 1947, to give aid to the countries of Western Europe (along with Greece and Turkey), in large part with the hope of keeping them from falling under Soviet domination.〔(【引用サイトリンク】 title =The Truman Doctrine and the Marshall Plan )〕 In 1949, a Communist-backed government, led by Mao Zedong, was instated in China (officially becoming the People's Republic of China).〔(【引用サイトリンク】 title =Mao Zedong outlines the new Chinese government )〕 The installation of the new government was established after the People's Liberation Army defeated the Nationalist Republican Government of China in the aftermath of the Chinese Civil War (1927-1949).〔(【引用サイトリンク】 title =The Chinese Revolution of 1949 )〕 Two Chinas were formed - mainland 'Communist China' (People's Republic of China) and 'Nationalist China' Taiwan (Republic of China). The takeover by Communists of the world's most populous nation was seen in the West as a great strategic loss, prompting the popular question at the time, "Who lost China?"〔(Rogue Regimes: Terrorism and Proliferation, pg. 230 ), Raymond Tanter, Macmillan, 1999〕 The United States subsequently ended diplomatic relations with China in response to the communist takeover in 1949.〔 Korea had also partially fallen under Soviet domination at the end of World War II, and in 1950 fighting broke out between Communists and Republicans that soon involved troops from China (on the Communists' side), and the United States and 15 allied countries (on the Republicans' side). Though the war never officially ended, the fighting ended in 1953 with an armistice that left Korea divided into two nations, North Korea and South Korea. In May 1954, the Viet Minh, a Communist and nationalist army, defeated French troops in the Battle of Dien Bien Phu and took control of what became North Vietnam.〔(【引用サイトリンク】 title =11. French Indochina/Vietnam (1941-1954) )〕 This caused the French to fully withdraw from the region then known as French Indochina, a process they had begun earlier.〔(【引用サイトリンク】 title =1954 DIEN BIEN PHU )〕 The regions were then divided into four independent countries (North Vietnam, South Vietnam, Cambodia and Laos) after a deal was brokered at the 1954 Geneva Conference to end the First Indochina War.〔(【引用サイトリンク】 title =1954: Peace deal ends Indo-China war )〕 President Eisenhower was the first to refer to countries in danger of Communist takeover as dominoes, in response to a journalist's question about Indochina in an April 7, 1954 news conference, though he did not use the term "domino theory".〔(President Eisenhower's Press Conference of April 7, 1954 )〕 If Communists succeeded in taking over the rest of Indochina, Eisenhower argued, local groups would then have the encouragement, material support and momentum to take over Burma, Thailand, Malaya and Indonesia; all of these countries had large popular Communist movements and insurgencies within their borders at the time. This would give them a geographical and economic strategic advantage, and it would make Japan, Taiwan, the Philippines, Australia, and New Zealand the front-line defensive states. The loss of regions traditionally within the vital regional trading area of countries like Japan would encourage the front-line countries to compromise politically with communism. Eisenhower's domino theory of 1954 was a specific description of the situation and conditions within Southeast Asia at the time, and he did not suggest a generalized domino theory as others did afterward. The John F. Kennedy administration intervened in Vietnam in the early 1960s to, among other reasons, keep the South Vietnamese "domino" from falling. When Kennedy came to power there was concern that the communist-led Pathet Lao in Laos would provide the Viet Cong with bases, and that eventually they could take over Laos. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Domino theory」の詳細全文を読む スポンサード リンク
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