US developed their nuclear bomb in 1945, yet they only had a short 'monopoly period' as the USSR achieved the same feat in 1949, much earlier than the Americans had anticipated.
From then on, the nuclear arms race led to thermonuclear devices, with the US hydrogen bomb (1952) and the USSR's lithium bomb by 1953
The Baruch Plan had ultimately failed to prevent proliferation
Intercontinental bombers, B-52 (US) and the TU-20 Bear (USSR)
Atlas ICBM tested by the USA in 1957
Polaris SLBM given large investment by Kennedy in 1960
Gaither Report (1957) and the purported 'missile gap' encouraged greater production
NASA established in 1958
Development of Second Strike Capabilities
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