I did not say that size in and of itself was the key I said maritime trade was the key have you been reading the posts at all. Technically one could say that indeed it is not trade but logistics that is the key, Russia had bad logistics America did not for the reasons outlined repeatedly
On the point about size it merely gifted America with plenty resources and as continually stated they had the ability to use them effectively from early on.
Germany is also a land power but crucially it's goods can reach the sea also German logistics are better as it's river and later it's rail system was more integrated.
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