Here's a totally random theory....I'm sure this can't be accurate, but anyway:
A lot of the US settlers left Britain due to religious persecution, dreams of a better life, etc. Maybe some of these people were rowdier than those who stayed behind in the UK, and thus the US is less civlized. This could also be because the early settlers here had to "rough it" compared to the people back in the UK, so we just grew up being rowdier and thus loving sports more.
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