This document discusses the origins and development of detente during the Cold War between the US and USSR. It outlines the phases of the Cold War from 1946-1976. Detente emerged during the third phase from 1953-1957 as tensions grew but the two superpowers also engaged in some negotiations. The fourth phase from 1957-1962 saw some peaceful exchanges but also the Cuban Missile Crisis. The fifth phase led to a nuclear test ban treaty in 1963 but disputes remained. The sixth phase created a more suitable climate for detente, culminating in arms limitation treaties in 1972-1973 as cooperation increased between the US and USSR.