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The overall population doesn't really matter; it's how many people there are within the localized region who are willing to travel the given distance. In the UK, there simply are more people within the relevant radius of the circuit(s) in question.
And as was also pointed out, it wouldn't be an issue if, like this year, the two events are on opposite sides of the country (generally quoted as 3,000 miles across), but next year, VIR and Road Atlanta are only ~350 miles apart.
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