The series is rounded off by this volume which focuses on how institutions, laws and social practices work together to integrate immigrants into countries after their arrival. The chapters bring both theoretical and empirical analysis to bear on how migrants blend in, maintain contact with their countries of origin, make social and economic progress in subsequent generations, and obtain the social and political benefits of citizenship. The volume is highly interdisciplinary, drawing on the research of demographers, lawyers, and sociologists. It is also explicitly comparative, underscoring the similarities and differences in how the United States and Germany conceive of the role of immigrants in their societies and how the two nations incorporate them into civil and political society. Introductory and concluding chapters highlight the principal themes, findings, and policy implications of the volume.