re: Amazingly, American Football is not in Europe... why?

Rugby fields the same 15 guys for the duration of the 80 minute game with very few interruptions from the officials. It has much more flow than football and momentum is a vital component of the action. Some rugby players are 6'8 and up to 260 lbs and run almost the entire 40 minute half. I like football but having 53 men playing a game with stops every few seconds, time-outs and the like, sure, you can get bigger "athletes" that are 350lbs plus. But come on, they're going to be puffing on oxygen on the sideline after only a few minutes.
Europeans prefer games that have momentum. Soccer, Rugby and Basketball have that. Football, not so much.