Immigration today evokes passionate debates over questions of national identity, state sovereignty, and citizenship. Even as capital, goods, and services flow easily over national boundaries, human beings are subjected to intense scrutiny and resistance when crossing borders. In this collection of essays, distinguished scholars probe the challenges and opportunities that global migration presents for individuals, states, and societies grappling with questions of identity, belonging, and citizenship. Multidisciplinary in scope, the book demonstrates how forced and voluntary migrations intersect with global politics, from economic and environmental crises to human rights and security.