Which of these factors played a major role in preventing a war between the Soviet Union and the United States?

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Your answer will be the Nuclear Non-Proliferation Treaty  The Nuclear Non-Proliferation Treaty signed in 1968, and came into force in 1970, with 189 countries signing the treaty. The treaty was used to limit the spread of nuclear weapons. The treaty has 3 main pillars, disarmament of current nuclear weapons, able to use nuclear technology for peaceful technology, and nonproliferation of the spread of nuclear weapons hope this helps :D  

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