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
Foreign interventions by the United States US troops remain in South Korea to deter further conflict, as the war has not officially ended. President Harry Truman was unable to roll back the North Korean government due to Chinese intervention, but the goal of containment was achieved. During the Cold War, the US frequently used the CIA for covert operations against governments considered unfriendly to US interests. In 1949 under US President Harry Truman, a coup overthrew an elected parliamentary government in Syria, which had delayed approving an oil pipeline requested by US international business interests in that region. The exact role of the CIA in that