David Brooks on why those who want to have larger families are moving to the exurbs. "If you wanted a one-sentence explanation for the explosive growth of far-flung suburbs, it would be that when people get money, one of the first things they do is use it to try to protect their children from bad influences.

So there are significant fertility inequalities across regions. People on the Great Plains and in the Southwest are much more fertile than people in New England or on the Pacific coast."

Brooks bases his piece, in part, on this by Steve Sailer, but comes to different conclusions. Both are worth reading.