Question

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Answer 1

...the democratic United States and the communist Soviet Union became engaged in a series of largely political and economic clashes known as the Cold War. The intense rivalry between the two superpowers raised concerns in the United States that Communists and leftist sympathizers inside America might actively work as Soviet spies and pose a threat to U.S. security.

....The nuclear arms race was an arms race competition for supremacy in nuclear warfare between the United States, the Soviet Union, and their respective allies during the Cold War. During this period, in addition to the American and Soviet nuclear stockpiles, other countries developed nuclear weapons, though none engaged in warhead production on nearly the same scale as the two superpowers.