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Whilst Japan started a nuclear weapons project in October 1939 and Germany in September 1939, the United States was the first country to successfully use a nuclear weapon in war.

A project conducted during World War II to develop the first atomic bomb which was called the Manhattan Project. It was led by the United States, with British participation, also employing many exiled Jewish scientists from Germany, Hungary, Holland and Italy. The first nuclear weapon was detonated as a test by the United States at the Trinity site on July 16, 1945.

There are claims from an enciphered Japanese diplomatic signal sent from Stockholm to Tokyo in December 1944 which claim that Nazi Germany first used a nuclear weapon against Soviet forces south of Kursk in June 1943. Sop far there has been no corroboration of this message.

There are also several credible claims that a Nazi nuclear weapon was tested at the Baltic Island of Rugen in October 1944.

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13y ago

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