The decision to drop the atomic bomb was seen as necessary to quickly end World War II, avoid many Allied casualties from a potential invasion of Japan, and demonstrate U.S. military strength. By August 1945, Japan was not showing any willingness to surrender, which made using the bomb seem like the only way to achieve a fast end to the war.
The dropping of the atomic bomb was deemed necessary to expedite the end of World War II, prevent massive Allied casualties during a potential invasion of Japan, and send a clear message to other nations about U.S. military power. By August 1945, Japan showed no signs of surrendering unconditionally, making the bomb appear as the only viable option to ensure a swift conclusion to the war.
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