Nazi Germany surrendered unconditionally on May 8th 1945. In August 1945 the war in Europe was over. All parties knew that this reservation was strengthened by the possibility that an invasion might be unnecessary, as domestic rebellion or even revolution might topple the Japanese regime after widespread famine began in earnest (sometime in autumn 1945). This point was particularly important given that the Japanese Army and Navy were aware that President Truman and the US military had reservations about the monetary and human costs of a ground invasion. Show that Japan's conventional defense of the Home Islands against a possible Allied land invasion in October 1945 (''Operation Downfall') was untenable given the power and number of the Western Allies' nuclear weapons.Efficiently destroy two of the four remaining industrial cities (of a pre-war total of more than sixty) which climatic conditions had made difficult to raze with firebombing, as had been accomplished upon all other cities and most large towns.On the 6th and 9th of August 1945, the USA destroyed the cities of Hiroshima and Nagasaki with nuclear weapons, which resulted from the Manhattan Project.
