In less than a generation, the dominant image of American cities has transformed from one of crisis to revitalization. Poverty, violence, and distressed schools still make headlines, but central cities and older suburbs are attracting new residents and substantial capital investment. In most accounts, native-born empty nesters, their twentysomething children, and other educated professionals are credited as the agents of change. Yet in the past decade, policy makers and scholars across the United States have come to understand that immigrants are driving metropolitan revitalization at...