Book excerpt: European Union citizenship is increasingly relevant in the context of both the refugee crisis and Brexit, yet the issue of citizenship is neither new nor unique to the EU. Using historical, political and sociological perspectives, the authors explore varied experiences of combining multiple identities into a single sense of citizenship. Cases are taken from Canada, Croatia, Czech Republic, Estonia, Spain, Switzerland and Turkey. These examples of communities being successfully incorporated into one entity are exceptionally useful for addressing the challenges facing the EU today.