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https://en.wikipedia.org/wiki/Great_Migration_(African_American)

One effect of the Great Migration was that blacks moved away from rural to urban areas including the South. Where do most blacks in Alabama live? Cities (not rural) such as Birmingham

Urban life is not a legacy of slavery

That's all well and good, but county slave population 200 years ago has predictive power on black population in a county today. The only interpretation of that (that makes sense) is legacy of slavery.

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