Nice cherry-picked list. LOL Let's look at another list, with a lot more sports represented--Summer and Winter Olympics medals:
In major sports, there's no question the US dominates. It's easy to find sports where the US doesn't really have much of an audience, but that doesn't mean shit.
Just to pick one, if you think the US couldn't win in F1 if there was an impetus for it, you might want to ask what happened at the 24 Heures du Mans in the late 60s. US motorsports can compete and win anywhere, if there is a want. The problem isn't that F1 is a bad sport, quite the contrary. The fact is that for the American race fan, it's a helluva lot more fun to go to a NASCAR or IndyCar race, and you get way, way more for your money. For the fan, off-the-track, F1 is overpriced and simply under-delivers. Whereas in NASCAR and IndyCar, it's not that big a deal for a fan to have access to the drivers and the pits and paddock (even DURING the race, if you have the right ticket) those kinds of experiences are practically non-existant in F1, unless you are a multi-millionaire or a model-actress type.
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But to get this back on-topic, I don't think the US "domination" of MMA is nearly as deep as some make it out to be. I think when the sport opens up, it'll be even tougher to make that claim. When Mexico and Central America really open up for MMA, I think it won't take long before you see a situation similar to Boxing in the lighter weight classes of MMA. We haven't even come close to seeing the depth of fighting talent from elsewhere in the world yet.