It hasn't sad to say. As tech advances so do the weapons, though continueing manufacture in some areas is quieter and less clear to the observer. The number of nukes has been reduced... but not by all. China builds her arsenal today without much concern for the western powers.
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The nuclear arms race was the core of the cold war.
Nuclear arms race was where Cold War was going with the belief that the more nuclear weapons you had, the more powerful you were
its the dang atomic bomb
The arms race was dangerous because neither the Soviet Union or the U.S could protect its people from a nuclear attack.
Around the end of 1944, due to Soviet spys. The US did not realize it had begun until the first Soviet test in 1949.