How did WW2 come to an end?

It ended with the unconditional surrender of the Axis powers. Germany surrendered on May 7th to the Western Allies, and May 8th to the Soviet Union, 1945, about a week after Adolf Hitler had committed suicide. Japan was able to hold out for another few months and was preparing for a desperate and bloody defense in the event of an American invasion of the home islands. Atomic bombs were dropped on Hiroshima and Nagasaki on August 6 and 9 respectively. After that the Imperial government sought the Emperor's personal authority to surrender which he granted. He made a personal radio address announcing the decision on August 15, 1945. The surrender was signed on Sept. 2, 1945 aboard the battleship A.S.S. Missouri in Tokyo Bay.