It isn’t so easy to beat a population into submission. Using inhumane tactics often leaves the population with powerful grievances nothing left to lose, and therefore creates more resistance. Granted, this can be possible as shown by Stalin’s work in Chechnya…where by shipping most of the population to Siberian gulags, this was temporarily achieved. By the way, how is Chechnya working out today (about 70 years later) for Russia? How did Afghanistan work out for Russia? It is telling they left because it was simply too expensive for them to continue; which will eventually be what happens to the US in Afghanistan as well.
If an invader wishes to annex a large territory by force against a large population (and Chechnya is quite small) who are opposed, the armed forces can never leave. That is my point…much of the German war machine would be forced in holding actions in Russia. Spending this kind of resources would not leave much for the Germans to use against the USA, though of course they would have sufficient oil and other resources they needed as somewhat of a tradeoff.
The USA could not outproduce Germany? Before the war the USA industrial output exceeded that of the combined axis by quite a bit.
http://en.wikipedia.org/wiki/Military_production_during_World_War_II
Lets take 1942 as the base year. The USA alone had industrial output of 1235 compared to an Axis combined of 902 (units of billion international dollars, 1990 price) which includes the help from their conquests. Under the assumption of the fall of Russia, we could maybe add their full total of 274 and the Axis production would still be less…1176 < 1235. I would also suggest that the Russian scorched earth policy would prevent this from ever happening.
Now the addition of the $353 from the UK would potentially have the axis at a greater level than the US…1529 > 1235…except from this we should subtract Canada, Australia, India, New Zealand, S. Africa, etc. as well as whatever scorched earth policy the UK enacted.
I wasn’t able to find numbers of the industrial ouput for the parts of the British empire without the UK, but it is significant. See for example, Canada alone had a very substantial industrial production…
http://en.wikipedia.org/wiki/Military_history_of_Canada_during_World_War_II
Over the course of the war, 1.1 million Canadians served in the Army, Navy, and Air Force. Of these more than 45,000 lost their lives and another 54,000 were wounded.[5]The financial cost was $21,786,077,519.12, between the 1939 and 1950 fiscal years.[6] By the end of the War, Canada had the world’s fourth largest air force,[7] and third largest navy.[8] As well, the Canadian Merchant Navy completed over 25,000 voyages across the Atlantic.[9] Canadians also served in the militaries of various Allied countries.
Regarding the A-bomb. Yes, we only had three in 1945. How many thousand (or tens of thousands) did we have in 1955? Had the war continued, no doubt more would continue to be built. And regarding a delivery system, which would be easier to develop/reverse engineer, the A-bomb or the V-2? We would have developed a suitable delivery system, I think, before the Axis could have duplicated the manhattan project.