To end WWII without the potential loss of many American military lives which would have occurred in Japan was invaded. The Japanese military was brainwashed into suicidal acts rather than surrender to an enemy.
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Actually the US did NOT develop the atomic bomb for use against Japan, it was developed to make sure we got it before Nazi Germany! If Hitler had gotten nuclear weapons there would have been no stopping him anywhere! We HADto try as hard as we could to see that we would have them before Hitler.
However Germany's nuclear project had, unknown the US, turned toward reactor development not bombs, so our fear was unfounded. Also Hitler and the Nazi's didn't trust this new nuclear physics, too many of its developers were Jews and it sounded a lot like "Jewish Physics" (which if you were found teaching it in a university could get you fired or shot).
By the time the US had its first atomic bomb Germany had already surrendered. So the motivation for developing it was gone. But the war wasn't.
The bomb ended up being used on Japan because:
To end the last and hopefully final World War.
We also took over Japan's military and now own it, because we cannot ever trust them because they murdered innocent people with a surprise attack on pearl harbor. If someone broke into your house and tried to murder your family, would you protect yourself against that so it would never happen again? well basically the United States was invaded by the Japs and it forever changed the history of the world.
Because Leo Szilard wrote a letter to FDR and had Einstein sign it, warning that the Germans might do it first.
To end WW2, that's why dropping it in Japan led to the end of WW2.
Atomic Bomb
the us created the atomic bomb
Einstein
To defend against a possible Nazi atomic bomb!
They developed the H-bomb, a bomb more powerful than the atomic bomb that the Americans dropped on Japan, and was stronger than the one that the Soviet Union detonated. The U.S. just wanted to be stronger than the Soviet Union.
Yes, both.
yes we did
no one
Manhattan Project
1949 thru 1950 prompted by USSR atomic bomb test.
Russia .
Project Manhattan.
To develop the atomic bomb for the USA.
Atomic Bomb
Develop an atomic bomb.
They has fled the fascist government in Germany
We had the machinery and minds able to do what some primitive countries probably did not have at the time to develop the atomic bomb. Also we had resources capable of making such a weapon that other countries didn't.