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1. a chain reaction similar to the falling of a row of dominoes, with each action (or fall) causing the next action (or fall). 2. a theory embraced by U.S. President Lyndon B. Johnson in the 1970s stating that allowing South Vietnam to fall to Communism would result in all of southeast Asia including even The Phillipines becoming Communist controlled. In this case, just two dominoes fell, Laos and Cambodia.
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