In Climbing Income Ladder, Location Matters

[Igel]

4. That map looks awfully familiar.

Combine things like Indian reservations with the demographic map showing African-American population density and you're most of the way there. S. Louisiana is a notable exception.

Some is due to having a more rural population--the "Black Belt," for instance, is still largely not "big city" (even if the cities in it may sometimes be large). But other areas are still poor, black, and in some cases urban--Chicago, Detroit.

Not a perfect match, and it's not an explanation just a correlation.