This book explores the attitudes, opinions and life experiences of first and second generation intra-state immigrants who are convinced and committed Basque nationalists. Based on in-depth interviews with activists, it challenges many of the assumptions often made about Basque nationalism as an exemplary case of ethnic nationalism in the exclusive sense. Focusing on activists' migration history, their experiences of social and political inclusion and exclusion, their national and regional identities, their political identities and their experiences of political activism, the author explores the role of origins, identity and life experience in activists' willingness to engage with Basque nationalism. As such, Intra-State Immigrants as Sub-State Nationalists will appeal to scholars of sociology and politics with interests in migration, national identities and nationalist movements.