The Cold War era refers to the period of geopolitical tension between the United States (and its allies) and the Soviet Union (and its allies) from roughly 1947 to 1991. It was characterized by political hostility, military buildup, and ideological differences between these two superpowers.
Related terms
Arms race: A competition between nations to develop superior military capabilities, particularly in terms of weaponry.
Iron Curtain: A metaphorical term used during the Cold War era to describe the division between Western Europe (capitalist democracies) and Eastern Europe (communist countries).
Détente: A period of relaxation or easing tensions between rival powers through diplomacy rather than aggressive actions.