Answer:
Neither superpower would start a nuclear war because the other side could respond in an equally destructive manner.
Step-by-step explanation:
Mutually Assured Destruction (MAD) is a doctrine of security policy and international politics that provides a reason why powerful countries might not want to engage in the use of nuclear weapons. The doctrine states that the use of nuclear weapons by one side of a war would mean the complete annihilation of both sides. This means that, when two countries are armed with nuclear weapons, neither side has an incentive to initiate a conflict.