> The opposite scenario of Germany controlling all the resources of Europe and Africa is a scary proposition.

It shouldn't be. In WW2, in 1942, Germany did essentially control all of Europe, save only the UK. And at the height of its power, Germany's vast industrial machine produced roughly on par with the UK. Not the entire British Empire, just UK.

It turns out that the Nazis were complete incompetent buffoons when it came to economic management. Their grand master plan for Europe was to overrun the east, not for some vast rich treasure trove of minerals to fuel an industrial juggernaut, but to plop down more homesteads to feed their inefficient agricultural economy. And even if the Nazis had a grand plan to become an industrial juggernaut, they still faced the prospect of the industrial juggernaut par excellence, the US.