Final answer:
Before August 1945, Japanese military leaders refused Allied requests for surrender, but following the atomic bombings and the Soviet invasion of Manchuria, Japan agreed to surrender.
Step-by-step explanation:
Before August 1945, military leaders in Japan refused Allied requests for their surrender. Despite the Allies' demand under the Potsdam Declaration for Japan to offer an unconditional surrender or face 'prompt and utter destruction,' the Japanese government remained silent. It wasn't until after the devastating atomic bombings of Hiroshima on August 6 and Nagasaki on August 9, and the Soviet invasion of Manchuria, that the Japanese cabinet ministers agreed to the Allied terms for surrender on August 10. Emperor Hirohito officially announced Japan's intent to surrender on August 15, 1945, which was formalized with the signing of the surrender document aboard the USS Missouri on September 2, 1945, effectively ending World War II.