[L]egal abortion is the main cause of family breakdown, including specifically the rise in rates of divorce, illegitimacy and crime, and entry of most developed nations–now including the United States–into “demographic winter.”
. . .
“taken in its entirety, legal abortion is perhaps the single largest American economic event of the past century, more significant than the Great Depression or the Second World War.”
. . .
Legalizing abortion raised crime rates immediately and with a lag by turning new fathers back into men without dependent children.
. . .
Finally, the birth rate is strongly and positively related to the rate of weekly worship. This is because all gifts of scarce resources—whether rearing a child or worship—require the same lowering of self and raising of others in our scale of preferences for persons. On average throughout the world in 2005-10 (adjusted for differences in mortality), a couple which never worshipped had an average of 1.2 children; but the average couple which worshipped at least once a week had 2.4 more—an average of 3.6 children.
Social and Economic Costs of Legal Abortion, by John D. Mueller