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The domino effect refers to a small change which will cause a similar change nearby, which then will cause another similar change, and so on in linear sequence, by analogy to a falling row of dominoes standing on end. Domino effect also relates to chain of events.
 
 
 
The domino theory was a 20th Century foreign policy theory, promoted by the government of the United States, that speculated if one land in a region came under the influence of Communists, then more would follow in a domino effect. The domino effect suggests that some change, small in itself, will cause a similar change nearby, which then will cause another similar change, and so on in linear sequence, by analogy to a falling row of dominoes standing on end. The Domino Theory was prosecuted by successive United States administrations during the Cold War, to justify American intervention around the world.
 
The domino theory was first proposed by President Dwight D. Eisenhower and his top advisers in 1954 to describe the prospects of communist expansion across Asia if Indochina were to fall. Eisenhower argued that all of Southeast Asia could fall under the sway of Communism (and by implication, under the de facto control of Communist China and/or the Soviet Union) unless America and its allies took direct action against Communist-backed “national liberation” movements in countries like South Vietnam, Laos and Cambodia, which were seen as being especially vulnerable to a Communist takeovers.
 
Although widely accepted and actively promoted by the politicians and diplomats of the United States and its allies (including Australia), the theory’s ultimate validity was and remains highly dubious. Opponents of the Domino Theory argue that it was concocted to support America’s overt military involvement in Southeast Asia, which was underpinned by extensive covert activity in the region, through agencies including the CIA, who secretly gave financial and logistical support to puppet regimes in countries like South Vietnam, and who were active in many Asian nations, secretly undermining and obstructing left-wing political parties, national liberation movements, trade unions and other associations and actions which the U.S. perceived as being contrary to its strategic and economic interests.
 
 
All this kinda reminds me of the Middle East region, using WMDs and Terrorism as an excuse to maintain military and strategic power in the region, to preserve its economic interests.