The term you're looking for is Détente. Détente refers to the easing of tensions and the improving of relations between the Soviet Union and the United States during the 1970s, especially through diplomatic efforts, arms control agreements like SALT (Strategic Arms Limitation Talks), and a general reduction in hostilities compared to earlier periods of the Cold War.
What was the easing of tensions between nations, usually in reference to the 1970s period of the Cold War?
SALT
Détente
Escalation
Inflation
1 answer