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Well there can be many different answers to this question but the one that makes the most sense to me is because the U.S. was very mad that Japan attacked the U.S. on IT'S soil (Pearl harbor) so the U.S. got so mad that they dropped a atomic bomb on Japan to end the war once and for all. Also they chose this over a land invasion because after they calculated the results they thought a land invasion would be too costly for both sides.

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14y ago

What else can I help you with?