It is the privileged Americans who are marrying, and marrying helps them stay privileged,” said Andrew Cherlin, a sociologist at Johns Hopkins University.
About 41 percent of births in the United States occur outside marriage, up sharply from 17 percent three decades ago. But equally sharp are the educational divides, according to an analysis by Child Trends, a Washington research group.
Less than 10 percent of the births to college-educated women occur outside marriage, while for women with high school degrees or less the figure is nearly 60 percent.
Long concentrated among minorities, motherhood outside marriage now varies by class about as much as it does by race. It is growing fastest in the lower reaches of the white middle class — among women like Ms. Schairer who have some postsecondary schooling but no four-year degree.