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 tank battles once feared would rage across Western Europe. It is with Canada's late-Cold War and early-Peacekeeping Era military that Canada would embark on its deployment to Afghanistan, currently Canada's longest-running war. Canada in the Cold War During the Cold War, Canada was one of the western powers playing a central role in the major alliances. It was an ally of the United States, but there were several foreign policy differences between the two countries over the course of the Cold War. Canada was a founding member of the North Atlantic Treaty Organization (NATO) in 1949, the North American Aerospace