Trends in marriage are important not just with regard to the organization of communities, but because they are associated with large effects on the socialization of the next generation. No matter what the outcome being examined—the quality of the mother-infant relationship,5 externalizing behavior in childhood (aggression, delinquency, and hyperactivity),6 delinquency in adolescence,7 criminality as adults,8 illness and injury in childhood,9 early mortality,10 sexual decision making in adolescence,11 school problems and dropping out,12 emotional health,13 or any other measure of how well or
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