In a world of mutually exclusive nation-states, international migration constitutes a fundamental anomaly. No wonder that such states have been inclined to select migrants according to their origins. The result is ethnic migration. But Christian Joppke shows that after World War II there has been a trend away from ethnic selectivity and toward non-discriminatory immigration policies across Western states. Indeed, he depicts the modern state in the cross-fire of particularistic and universalistic principles and commitments, with universalism gradually winning the upperhand. Thus, the policies that regulate the boundaries of states can no longer invoke the particularisms that constitute these boundaries and the collectivities residing within them. Joppke presents detailed case studies of the United States, Australia, Western Europe, and Israel. His book will be of interest to a broad audience of sociologists, political scientists, historians, legal scholars, and area specialists.