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Between 7-16-1945 and 11-4-1962 the USA and the USSR performed a combined total of 423 nuclear tests by detonating atomic bombs in the oceans, lands and atmosphere.
After the Limited Test Ban Treaty was signed in late 1963 nuclear testing went underground. The U.S.A. detonated a further 1149 bombs (until 1992), and the U.S.S.R exploded another 969 (until 1990) atomic bombs into the Earth .
There are approximately 14,900 nuclear warheads in nine nations' arsenals in 2017. 7,000 belong to Russia, 6,800 belong to the U.S., France has the next highest number with 300.






