On August 6, 1945 (Showa 20), Hiroshima, Japan, suffered an atomic bombing by the United States. Regarding the question of why Japan had to encounter a nuclear attack by the United States, a familiar statement found in almost all history textbooks is: because Japan refused to accept the Potsdam Declaration, the United States decided to launch a nuclear attack on it, and the Soviet Union also declared war and sent troops (China northeast). For the United States, this is the so-called “best strategy to end the war as soon as possible and avoid a war on Japan’s mainland that will cause more bloodshed.” But this argument may not actually…