How did Germany, in just 6 years, go from depression to being so powerful it took the combined effort of the UK, USSR and US to defeat them?

Those 3 countries were recognised as the superpowers after the war and couldn't have done it without the others. Without Lend-Lease and the Eastern Front the UK would've had to surrender. Without British and American aid and without many German troops in the West defending against an Allied landing, the... show more Those 3 countries were recognised as the superpowers after the war and couldn't have done it without the others. Without Lend-Lease and the Eastern Front the UK would've had to surrender. Without British and American aid and without many German troops in the West defending against an Allied landing, the Soviets would've been defeated. And without the UK, the US wouldn't be able to land in Europe and there would be many more German troops in the West if it weren't for the Eastern Front. The UK and US wouldn't have been prepared to sacrifice several million soldiers like the Soviets did either.
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