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1945
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US. End WW2.
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July 16, 1945 was the first nuclear bomb test by the United States.
The first was made in the US. The purpose was originally to defend against the possibility of a Nazi bomb. 1945.
no the us did
the US army headed a secret team of scientists called the Manhattan project - they did the science, developed the ideas and worked with engineers to make the first atomic bomb on 1944-1945.
The Manhattan Project resulted in the US creating the first nuclear bomb, which was the cause for Japan to surrender.
The atomic bomb has been replaced by the nuclear bomb. This type of weapon was first developed by the US in the early 1950's. Soon afterwards, the Soviet Union also created their own style of nuclear weapons and bombs.