Where Have All the Children Gone?

Scrolling through Facebook on Mother’s Day, I noticed that there are now more best wishes from pets than humans (although I suspect a human is posting for said pet). Cute, but I wondered, “Where have all the children gone?”
In 1950, American birthrates were a little over 24 per thousand people. In 1960 that had dropped to a smidge under 23. By 1970 about 17 people per thousand were producing offspring…