- a theory that if one country is taken over by an expansionist, especially Communist, neighbor, party, or the like, the nearby nations will be taken over one after another.
in geo-politics, by 1963; see domino principle (1954).. Eisenhower’s original phrase was
The idea that if one key nation in a region fell to control of See policy of .), others would follow like toppling dominoes. The was used by many American leaders to justify American intervention in the . (