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Any guesses on why that is? Is it culture?

Is this English language literacy? You can see that strip on the southern border of texas which probably has many native Spanish speakers.

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ooh good point

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My guess is that it's correlated with unpleasant weather. If you're stuck inside, reading's one of the entertainment options.

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bad chart. It's just a proxy for % of spanish as motherlanguage

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You need something to do in winter. Heat also has been shown to make it harder to think.

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