Forget Iran, What If Hitler had the Bomb?

This is an unthinkable thought, but let's suppose Hitler got the atomic bomb before we did and dropped it on England- three times. After that, he announced that he had submarines off the coast of America, and was prepared to launch short-range rockets with nuclear warheads on our major cities unless we surrendered unconditionally. Let’s say we did. Hitler would've moved troops into America, and occupied all the major cities in the country- much the way we did in Germany after the war. What happened next? The human race would likely be cleansed of all undesirables- possibly 20-30 million or more people would be eliminated.

(I'd like to think we pressed on, even with the devastation of England- we had Germany on the run.  Contining to fight in the shadow of atomic war would've been horrific. If we did continue the fight, would we have dropped the bomb on Germany to win the war? Probably.)

On the other fronts, both the Soviet Union and Japan would lay down their arms- The Soviets would surrender because they want to avoid the bomb. The Japanese, quite afraid of tangling with Germany also, would cease all fighting. They would negotiate a settlement with Germany that gives them control of the Pacific Rim and the Pacific Ocean. They would get no part of America, except Hawaii and the islands in the Pacific.

Do you think this could’ve been the worst scenario for humankind? I do. It makes me realize how indebted we are to the “greatest generation”. If a war ever had to be won, unequivocally, this one did. The fate of humankind stood in the balance.

Are there other outcomes looming in the future that could have that impact on the world? Only the cold war came close.  We still have atomic bombs  aimed at each other with mutually assured distruction- MAD. By comparison, is Iran or Al Qaeda really that significant?