How many existing basic design types are there of the weapons the United States and the Soviet Union had an arms race over?
Nuclear arms race The nuclear arms race was a 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.
Tsetse (nuclear primary) The Tsetse was a small American nuclear bomb developed in the 1950s that was used as the "primary" in several US thermonuclear bombs and as a small stand-alone weapon of its own. Primary is the technical term for the fission bomb component of a fusion bomb, used to start the reactions and implode and detonate the second, fusion stage.