This panel examines the impact of migration and immigration on European politics and societies. Our research projects analyze how people’s movement across national borders influences political institutions, government policies, the recalibration of citizenship, the political representation of minority groups, local-level integration schemes, and the strength of civil societies. The papers evaluate state responses to international mobility, old and new. They do so both through the lens of migrant-receiving countries that attempt to control immigration and integrate migrant-background citizens into the political community, as well as from the perspective of the migrants’ countries of origin that are increasingly willing to tolerate dual citizenship in order to cultivate the connection with expatriates and diasporas. Contributions highlight the importance of studying the politics of migration in a broader context that takes into account historical legacies, the international dimension, gender, social inequality, electoral and administrative institutions, as well as diffusion and learning mechanisms. Through new datasets, case studies and cross-national comparisons, these papers shed light on the way in which a rigorous and systematic assessment of contemporary migrations enables researchers to decode seemingly contradictory politico-economic dynamics of openness and closure, and envision European futures in the globalization era.