The U.S. originally built the atomic bomb to end WW2 because it was the only alternative to invading Japan, which would have cost many, many more lives and been worse for all involved. Now atomic bombs are used for a balance of power - "If you nuke us we'll nuke you back" is enough to stop a few wars.
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the Nazi didn't build the atomic bomb the Americans did....
It takes very little time to build an atomic bomb, once a country has the necessary industrial infrastructure to produce the fissile material.
the Manhattan project
The Manhattan Project was the secret project to design and build the world's first atomic bomb.
This program was the Manhattan Project. Started in 1942, the countries of Canada, United States, and Britain combined forces to develop the atomic bomb. In July, they were successful. The Trinity bomb was detonated in the New Mexico desert, which signified the first nuclear bomb explosion.