The Germans lost using the world's best rounds, 7 and9mm, and using the example of a team of two time losers is fallacy.
The Germans were disarmed for a period, and in the meantime and over many years, those other foreigners made it popular, but get serious, it was American ingenuity that turned a barely adequate mouse gun into a ravening hollow pointed death giving device that still is inferior to the .45. American bred and refined the .45 into a superior artifact capable of nearly unholy destruction. If we hadn't created it, Abracanastiness, the great war God from the depths of the very deepest level of the hell that is worse than any other hell would have dangled it like a ripe plum before the most evil souls in the universe, along with the promise of immortality as long as they spread evil and chaos throughout all of society.
Did you notice that Saddam Hussein wound up being hanged? He was using the nine mm.