In his prison cell at Nuremberg, Hitler's foreign minister, Joachim von Ribbentrop, wrote a brief memoir in the course of which he explored the reasons for Germany's defeat. He picked out three factors that he thought were critical: the unexpected 'power of resistance' of the Red Army; the vast supply of American armaments; and the success of Allied air power.
This last was Hitler's explanation too. When Ribbentrop spoke with him a week before the suicide in the bunker, Hitler told him that, 'the real military cause of defeat' was the failure of the German Air Force.
For the Allies in World War Two, the defeat of Germany was their priority.
For all his many failings Ribbentrop was closer to the truth than he might have realised. For the Allies in World War Two, the defeat of Germany was their priority. Italy and Japan never posed the same kind of threat as the European superpower they fought alongside. Their defeat, costly though it was, became irresistible. The key to ending the world crisis was the defeat of Hitler's Germany.