It’s likely they couldn’t have done so without our Lend Lease.
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Oh I’d say it’s more than “likely”. They wouldn’t have had a snowball’s chance in Hell.
Meh, not really. The beat Napoleon and probably would have come back on Hitler the same way. Germans would have taken Moscow, and there would have been a much longer harder turn around, but they could have done it eventually.
It was never in the cards that Germany would win in the east.
They got overconfident from knocking off unprepared western Euro nations that after WWI were utterly unprepared mentally for another war.
Then they jumped on the big kahuna. But Lend Lease was a huge help for them. And boots, trucks, and food were extremely important.