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
Non-intervention in the Spanish Civil War During the blockade of the Strait of Gibraltar by the Spanish Republican Navy one German Junkers was captured when it came down in Republican territory, and explained as 'merely a transport aircraft'. Its release would be required before Germany signed the Non-Intervention Pact. Portugal accepted the pact on 13 August, unless her border was threatened by the war. There was popular support in both countries for the plan, although whilst in the United Kingdom the socialist Labour Party was strongly in favour, the political left in France wanted to directly aid the Republicans. The Labour Party would reject non-intervention in