I also understand treating allies of one's opposition as combatants, it is very important for the Blitzkrieg style of combat as well.

America wasn't in it until we were pushed to be in it, so we weren't really any threat at first either. We were raking in the cash from remaining outside the conflict until we were dragged in.

Even today, Europe doesn't understand that it was ultimately our intervention that is the reason why they are where they are today.