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Causation isn’t correlation; zip code is easy to measure, but I’d bet it’s not what actually matters.

Zip code is a darn good proxy for race, family wealth, social standing, network prospects....

You can always move to another zip code.

Do we live in the same america?

I don't know where you are, but people come to America by the millions traveling thousands of miles on foot. Then they spread all over the country.

I'm sure some of them even live in 10021.