Why Did World War II Really End
History tells us that Japan surrendered as a direct result of both the Hiroshima and Nagasaki atomic bomb detonations, but Tsuyoshi Hasegawa's has different ideas, as another big event occurred immediately prior to the Japanese surrender, and that's a Russian declaration of war and invasion against Japan. According to Haseqawa, the night after Hiroshima was bombed, Japan showed concern but not panic. Two days later, Russia declared war on Japan and invaded Manchuria, and from that moment on Japan would have to deal with a Russian/US invasion from multiple fronts. He suggests that Japan elected to surrender to the USA not because of the atomic bomb, but because of the Russian threat and an underlying belief that the US would provide better surrender conditions than the USSR.