Spengler, over at AsiaTimes, did an analysis, trying to find the correlatives of fertility. He found two. Adult Literacy, which is negatively correlated with fertility; and Religious Belief, which is positively correlated with fertility.

20+ years ago I used to worry about the low fertility rate for the US (~1.8 back then). Then I read a piece in which a reporter let slip an important piece of information. One American woman in five simply wasn’t having kids. I did the math (1.8/.8 = 2.25) and quit worrying. The part of our population that is European in character is dying out just like Europe. The “old-fashioned, bitter, Bible-clinging” part is doing just fine.