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How did the bombings of Hiroshima and Nagasaki contribute to Japan's surrender?

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U.S. hydrogen bomb test in the Marshall Islands — nuclear weapon A test of a U.S. thermonuclear weapon (hydrogen bomb) at Enewetak atoll in the Marshall Islands, November 1, 1952.

The atomic bombings of Hiroshima (August 6, 1945) and Nagasaki (August 9, 1945) were pivotal events that hastened the end of World War II.41

While the Japanese government had been gridlocked regarding how to end the war, the destruction caused by these atomic weapons—combined with the Soviet Union’s declaration of war on Japan on August 8—tipped the internal political balance in favor of those advocating for a negotiated peace. Following the Nagasaki bombing, Japanese peace advocates were able to enlist Emperor Hirohito to intervene and order a surrender.231

On August 10, 1945, the Japanese government issued a statement agreeing to accept the surrender terms of the Potsdam Declaration, provided that the emperor’s position as a sovereign ruler would be preserved. Although some historians argue that the bombings were not the sole factor in Japan's capitulation—citing the impact of the Allied naval blockade and strategic bombing campaigns—they are widely recognized as having accelerated the conclusion of the conflict.421