Domino theory Domino theory The domino theory was a theory prominent from the 1950s to the 1980s that posited 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. U.S. President Dwight D. Eisenhower described the theory during an April 7, 1954, news conference, when referring to communism in Indochina: In 1945, the Soviet Union brought most of the countries of eastern Europe and Central
Canada in the Cold War student at Cambridge and Harvard he was a part of a Marxist communist study group. This made Pearson, who was still External Affairs Minister, backed by outrage across the country, send a note to the US Government, threatening to offer no more security information on Canadian citizens until it was guaranteed that this information would not slip beyond the executive branch of the government. It was during the Cold War period that Canada began to assert the international clout that went along with the reputation it had built on the international stage in World War I and World War II.