From email: "There is a little-known movement sweeping across the United States," writes David Brooks in the New York Times. "The movement is 'natalism' ": All across the industrialized world, birthrates are falling - in Western Europe, in Canada and in many regions of the United States. People are marrying later and having fewer kids. But spread around this country, and concentrated in certain areas, the natalists defy these trends. . . .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. You can...