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It's the culture.
The major sports in American are uniquely American. Soccer is the worlds most played and loved sport but it's not American. Baseball, football and basketball were invented (for the most part) and developed here.
It goes beyond even sports. Take music for example. How many artists have sold millions of records and have sell out shows all over the rest of the world but never even have a minor hit in the USA? We tend to stick to what we know and are leary of things that come from the outside.
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