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Détente

By the 1970s, with the Cold War's entering its 30th year with no direct conflict between the United States and the Soviet Union, the superpowers entered a period of reduced conflict, in which the two powers engaged in trade and exchanges with each other. This period was known as détente.

This period included negotiation of a number of arms control agreements, building with the Nuclear Test Ban Treaty in the 1950s, but with significant new treaties negotiated in the 1970s. These treaties were only partially successful. Although both states continued to hold massive numbers of nuclear weapons and research more effective technology, the growth in number of warheads was first limited, and later, with the START I, reversed.