Obviously, black people have moved all over the country. I don't even see what that has to do with anything. The rural deep south has lots of black people, in part because that's where their ancestors were brought as slaves.
Are MLK Blvd's a legacy of slavery? Maybe. That's the sort of thing I meant when I said the prompt is overly vague.
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
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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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