Which of these was a feature of the relationship between the Soviet Union and the United States in the era leading up to détente?

nuclear war
direct conflict
arms race
cooperation

Cooperation

A bit more info: Cold War tensions between the U.S. and the Soviet Union from 1967 to 1979. The era was a time of increased trade and cooperation with the Soviet Union and the signing of the Strategic Arms Limitation Talks (SALT) treaties

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