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For a time after World War II, America held the upper hand with regards to nuclear superiority. It used this threat of "massive retaliation" as a means to deter Soviet aggression. By the late 1950s the Soviet Union had built up a convincing nuclear arsenal that could be delivered on the territory of the United States and Western Europe. By the mid-1960s unilateral deterrence gave way to 'mutual deterrence', a situation of strategic stalemate. The superpowers would refrain from attacking each other because of the certainty of mutual assured destruction, better known as MAD. This theory is still a major part of the defense policies of the United States and Russia. This led to the foundation of the nuclear triad, or use of three different types of delivery systems (bombers, missiles, and submarines), to assure that a second-strike capability existed able to cause massive destruction to the attacking nation.