1. The USA had developed its atom bomb during the Second World War
2. The USSR wasn't far behind and in 1949 succeeded in exploding its own atom bomb
3. The USA detonated the first hydrogen bomb in 1952
4. The USSR followed with its own hydrogen bomb by 1955
5. 1957- the USSR test-fired the first ICBM, which could strike the USA after being launched from within the USSR, which was virtually unstoppable
6. The USA's Atlas ICBM was launched later the same year, and the USA quickly increased its stock of these missiles until it had a significant advantage over the USSR
7. The USSR began catching up again as American resources were diverted into a war in Vietnam
- By this point, the USSR and the USA had the power to destroy each other and as tensions increased, the threat of a nuclear war became a real possiblity
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