The most likely reason why President Truman ordered the atomic bomb dropped on Japan was to

Truman’s main stated goal was to end the war quickly by forcing Japan to surrender to the Allies. The atomic bombs were intended to make Japan’s leaders accept surrender without a prolonged invasion and further fighting. Showing U.S. strength and influencing the Soviet Union may also have mattered, but the best answer is “force Japan to surrender to the Allies.”

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