Migration and integration have become defining political and social questions of our time. Across Europe and beyond, public debates over belonging, citizenship, and identity are increasingly shaped by the movement of people and how societies respond to this mobility. While these issues are often framed in the language of crisis, they are in fact embedded in much longer histories of nation-building, boundary-making, and political negotiation. This book engages with these deeper dynamics, approaching the politics of integration not as a technical policy matter, but as a contested arena where values, identities, and power are continually renegotiated.