The book examines current　issues and trends in migration and citizenship from the perspective of Australia, Canada, and the　United States. These countries share a history of　immigration and emigration, extensive experience with mobile communities, and with integrating culturally diverse populations. They also share an approach to automatic citizenship based on the　principle of , and a relatively open attitude towards　naturalization. This volume explores the significance of political structures, political agents and political culture in shaping processes of inclusion and exclusion in these diverse societies. This book was originally published as a special issue of