You're not confused. The parent to this subthread is introducing race as an unnecessary/unsupported factor: the belt of low-age births is simply the bible belt.

You're not confused. The parent to this subthread is introducing race as an unnecessary/unsupported factor: the belt of low-age births is simply the bible belt. You don't need to "subtract" race from it (nor can you; it's not clear how you'd map race to birth age without a chart explicitly making the comparison). This whole subthread is a non-sequitur. You can see the pattern in every map except the unmarried, no-college degree map (which is almost entirely in the lowest bin on the histogram).