Germany was fighting a war with
US-led forces on the one hand
and Soviet Union on the other hand. The Wehrmacht had to split its resources for both fronts and could not reinforce its military force for the Battle of Kursk in 1943 due to this factor.
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US was also providing significant military aid to Soviet Union and focused on plugging its military capability gaps including logistics needs (i.e., Lend-Lease Act).
German logistics capability was a lot to be desired in comparison:
This is why Germany lost the war in the end.
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