A lot of people will tell you it was The Bomb. As a Cold War cryptologist, my vote is for the R-390A/URR radio receiver, used for decades by American intelligence to monitor the Soviets. The R-390 and the information gained from it allowed us to use diplomatic approaches to settling disagreements between us and the Soviets.
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The cold war was never cold nor hot.
A hot war is most dangerous to the army combatants and civilians, but a cold war can do just as much damage to the countries involved without a weapon being fired.
Vietnam was a "hot" battle of the "Cold War". The Korea was the first "hot" battle of the "Cold War."
The Cold War was not "cold" per say, but was simply the name of a war that took place.
The term "hot war" should, and was intended to be used, only in conjunction with the term "cold war." Meaning that a "cold war" is a non-shooting war; and a "hot war" is a shooting war. Extra examples: 1. People die in "hot wars." 2. People do not die in "cold wars." (accidents don't count).