2 United States
United States of America was the only and first country to use and produce nuclear weapons. They used it for the 1st time in World War II on Nagasaki and Hiroshima. The country possesses all the three types of weapons: Chemical, Biological and Nuclear weapons. They developed the weapons secretly in 1940s under “Manhattan Project”. It is the pioneer of development of hydrogen and nuclear fission bombs. It was the only country for 4 years to possess nuclear power until Soviet Union produced its own weapon.
It started its nuclear program on 21st October, 1939 and tested its first weapon on 16th July, 1945. The 1st fusion test was conducted on 1st November, 1952 and last nuclear test was done on 23rd September, 1992 with a total tests being 1,054. As of 1967, it had a stockpile of 32,040, whereas, in 2016, the stockpile was 4,670 usable.
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