Don't get me started on Baseball.. Also Murikan football.. ugh. if you want a true american sport, look up lacrosse, nothing gets more american than Lacrosse. I dont think most even know it exists, probably not even played in Europe i'd assume.
I played a lot of technical sports when i was in school, from soccer, lacrosse to wrestling. Just like you need the technical skills to be a good player in soccer, so to are the skill ceilings for being a good lacrosse player. Not only must you learn to play with both hands, but you need to be agile, quick, and always remember the ball that is only being cradled in the sticks net, not forcefully held. Just one of those sports that looks straight forward until you pick up the stick and on the first throw you put the ball straight down into the dirt, or throw it straight into the air.
I cant even fathom what other sport could be more american than one brutally gutted from the natives we stole it from, then injected with testosterone, because a american man sport cant be considered a sport unless you can knock the shoes and socks off another player.
Either way the short tl;dr version of it is as follows; Its just like hockey, with the exception that it is played in the air, and not on the ground like hockey or soccer. Its very fast paced, full contact, and hard as shit to play.
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oh, i wiki'ed it, seems they are taking it internationally, hopefully it will become a very well enjoyed sport