While migration and population settlement have always been an important feature of political life throughout the world, the dramatic changes in the pace, direction, and complexity of contemporary migration flows are undoubtedly unique. Despite the economic benefits often associated with global, regional, and internal migration, the arrival of large numbers of migrants can exacerbate tensions and give rise to violent clashes between local populations and recent arrivals. This volume takes stock of these trends by canvassing the globe to generate new conceptual, empirical, and theoretical contributions. The analyses ultimately reveal the critical role of the state as both an actor and arena in the migration-conflict nexus.