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Why did Emperor Hirohito insist that Japan surrender in August 1945?

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Map showing the territorial expansion of the Japanese Empire from 1870 to 1942 across East and Southeast Asia and the Pacific. The map uses color codes to indicate the original Japanese territory in 1870, subsequent acquisitions, and the farthest extent of Japanese occupation and conquest by 1942, including parts of China, Korea, Manchuria, Southeast Asia, and numerous Pacific islands. An inset map displays the broader reach of Japanese control at its peak. — Empire of Japan The Empire of Japan, 1870–1942.

Emperor Hirohito’s decision to insist on surrender in August 1945 was driven by the urgent need to end a war that had left Japan’s economy in ruins, its cities devastated by strategic bombing, and its military capacity severely depleted.1

While the atomic bombings of Hiroshima and Nagasaki and the Soviet Union’s entry into the war hastened the conclusion, historians note these were not the sole factors; the Allied naval blockade had already crippled Japan's merchant marine and exhausted the nation's supplies.1

The critical turning point for the Emperor occurred when the government sought a qualification to the Potsdam Declaration regarding the preservation of the imperial institution. After the Allies replied that the authority of the Emperor would be subject to the Supreme Commander of the Allied Powers, Hirohito set aside the tradition of imperial nonintervention and personally insisted on accepting the surrender terms to prevent further destruction. His immense personal prestige was ultimately sufficient to overcome resistance from military extremists who wished to continue the conflict.12