Granted, America was very late to the party in the first World War, but we did make it. We also had men fighting and dieing in the second World War, so lets not act like America just sat back and did nothing.
Unfortunately you did nothing.
/*now i use my fav argument to piss of elfies*/
When we fought Germany chewing up 80% of it's military machine (with at least 15% out of 20% left done by Wojsko Polsko) you kept playing around some forgotten islands for 3 years, until USSR interfered and cruched Japanese Continental Army in one decisive hit that took two weeks.
Disclaimer: your argumets sound as silly to me as a paragraph above may sound to some people on "blue" side.
Plus we never burnt down whole cities like brave "allied" air forces. And that's a truth no toejam.