Charles Murray essay in last Saturday's Wall Street Journal previewing his new book Coming Apart: The State of White America, 1960-2010:

... When Americans used to brag about "the American way of life"—a phrase still in common use in 1960—they were talking about a civic culture that swept an extremely large proportion of Americans of all classes into its embrace. It was a culture encompassing shared experiences of daily life and shared assumptions about central American values involving marriage, honesty, hard work and religiosity.

Over the past 50 years, that common civic culture has unraveled. We have developed a new upper class with advanced educations, often obtained at elite schools, sharing tastes and preferences that set them apart from mainstream America. At the same time, we have developed a new lower class, characterized not by poverty but by withdrawal from America's core cultural institutions.

... Marriage: In 1960, extremely high proportions of whites in both Belmont and Fishtown were married—94% in Belmont and 84% in Fishtown. In the 1970s, those percentages declined about equally in both places. Then came the great divergence. In Belmont, marriage stabilized during the mid-1980s, standing at 83% in 2010. In Fishtown, however, marriage continued to slide; as of 2010, a minority (just 48%) were married. The gap in marriage between Belmont and Fishtown grew to 35 percentage points, from just 10.

Single parenthood: Another aspect of marriage—the percentage of children born to unmarried women—showed just as great a divergence. Though politicians and media eminences are too frightened to say so, nonmarital births are problematic. On just about any measure of development you can think of, children who are born to unmarried women fare worse than the children of divorce and far worse than children raised in intact families. This unwelcome reality persists even after controlling for the income and education of the parents.