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In WW2 did America ever fight Germany when they were at their peak militarily? Or when they arrived in Europe they faced a weakened and worn out Germany? (I know they were losing at that point) or if there were any battles US lost in Europe to them.

For example Russia is defeated or instead for whatever reason they don't fight Russia and instead get a lend lease type of assistance from them (But no military assistance) how do America/Allies fair against Germany in Europe? Or would it be impossible for them to land in Europe?
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