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Definition of domino theory 1 : a theory that if one nation becomes Communist-controlled the neighboring nations will also become Communist-controlled 2 : the theory that if one act or event is allowed to take place a series of similar acts or events will follow
The domino theory was the basis for the United States strategy of containment, and the reason for entering the Vietnam War. ... The domino theory basically stated if one new countrywent communist in Asia then it would begin a chain reaction that would cause several more Southeast Asian countries becoming communist