saying the US 'barely participated' in WW2 is pretty egregious, just because the USSR did the majority of heavy lifting and very much could have won by itself doesn't mean that's what happened.
the majority of post-normandy heer formations deployed in the western front were the best equipped ones, the western front was denser than the eastern front and lend lease was large enough in scale to certainly have made a material difference. that doesn't mean that the US won the war by itself, or that the american sacrifice was anything comparable, but this sort of revisionism comes off as pretty crankish tbh.