The United States dropped the first atomic bomb on Hiroshima, Japan, on August 6, 1945. The Soviet Union declared war on Japan on August 8, 1945, two days after the bombing of Hiroshima. The Soviet Union's entry into the war was a significant factor in Japan's decision to surrender, as it effectively cut off any hope of a negotiated peace. On August 9, the United States dropped a second atomic bomb on Nagasaki, and on August 15, Japan announced its surrender, officially ending World War II.
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