World War II
The Allies wanted Japan to surrender without conditions, but Japan refused to do so. The United States dropped two atomic bombs over Hiroshima (August 6, 1945) and Nagasaki (August 9, 1945). On August 8, 1945, the Soviets entered the war against Japan and invaded Manchuria and quickly defeated the primary Imperial Japanese Army there. On August 15, 1945, Japan surrendered to the Allies. The surrender documents were formally signed on board the USS Missouri on September 2, 1945, which ended the war.