[A] funny thing happened in the 1990s: Almost every negative social trend tracked by the census, the Centers for Disease Control and the Department of Justice declined.
Teen birthrates fell by 30% between 1991 and 2002. The number of violent crimes in schools was halved between 1992 and 2002. Teen homicide rates dropped to their lowest level since 1966. Teen suicides decreased by 25%, and drug abuse, binge drinking and smoking all fell.
Yet the number of couples living together unmarried increased by more than 70% over the decade; the population at large increased by only 13% during this period. Gay and lesbian parenting became more common. The number of families headed by single mothers rose five times faster than the number of married-couple families.