During the Cold War, the United States and the Soviet Union engaged in an arms race in which both states invested heavily in developing and producing a large artillery of nuclear weapons. Each side sought to build more advanced and destructive weapons in order to protect themselves from attack and provide their allies with the weaponry or information on how to produce the weaponry

using this context give me 1 piece of evidence that there was a arms race

One piece of evidence of the arms race between the United States and the Soviet Union during the Cold War is the significant increase in the number of nuclear weapons possessed by each nation. By the 1960s and 1970s, both countries had amassed enormous arsenals, with the United States possessing approximately 31,255 warheads and the Soviet Union having around 40,159 warheads at its peak. This rapid buildup of nuclear weapons clearly demonstrates the extent of the arms race as both sides sought to outdo each other in terms of quantity and destructive capabilities.