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I think the main technology from the cold war was rocketry. The cold war was also the space race between Russia and the US. But in typical Human style, things normally intended to be peaceful can be re-purposed into something deadly. The technology of rocketry also allowed the creation of ICBM’s (Intercontinental Ballistic Missiles). This technology allowed anyone to launch an atomic strike anywhere from anywhere. This is why the Cold War was such a tense time. There were many close calls where a Nuclear War could have broken out.