Cold War era
Refers to the historical period of the Cold War, typically from the late 1940s to the early 1990s.
During the Cold War era, tensions between East and West persisted.
I like spy novels from the Cold War era.
冷戦 refers to the Cold War itself, while 冷戦時代 specifies the historical period.
Compound of 冷戦 (Cold War) and 時代 (era, period).