I think Imperial Germany would have prevailed in WW1 without US involvement. Their 1918 spring offensive was only stopped by US troops at Château-Thierry. And aside from that the Allied offensive later that year which ended up forcing the Germans to capitulate included over a million US troops and sailors. Would it succeed without them? I doubt it.
Without US involvement in WW2 on the other hand I think it's a tossup as to whether nazi Germany would have won. No US involvement means no fuel and supplies going to the British or the Russians. Do either stay afloat long enough for the US to be forced into it by Japan without it? The Brits maybe, they still had their navy and overseas possessions but the Russians probably not (IMO). The Germans would never have stalled before the gates of Moscow without US planes, tanks, fuel and ammo.
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Flanked by life and the funeral pyre. Putting on a show for you to see.
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