And the Soviets would have been so moved by Hitler's good example that they would have apologised for the Katyn massacre and meekly withdrawn from the other half of Poland.
Further, without the dastardly provocation of the British and French, Hitler would never have got so annoyed that he accidentally invaded Russia, so all that unpleasantness would have been avoided, and thus inspired by the power of appeasement the US would have persuaded all nations to suspend their embargoes against Japan, and Japan in turn would suddenly have seen the foolishness of their rampant culture of militarism and imperial expansion, and swept it away.
Peace would reign for a thousand years.
All spoiled because the UK and France wouldn't just let Germany invade Poland, not even a little bit. Meanies.