Changing Borders in Europe focuses on the territorial dimension of the European Union. It examines the transformation of state sovereignty within the EU, the emergence of varied self-determination claims, and the existence of a tailor-made architecture of functional borders, established by multiple agreements. This book helps to understand how self-determination pressures within the EU are creating growing concerns about member states' identity, redefining multi-level government in the European space. It addresses several questions regarding two transformative processes - blurring of EU borders and state sovereignty shifts - and their interrelations from different disciplinary perspectives such as political science, law, political economy and sociology. In addition, it explores how the variable geographies of European borders may affect the issue of national self-determination in Europe, opening spaces for potential accommodations that could be compatible with existing states and legal frameworks. This book will be of key interest for scholars, students and practitioners of EU politics, public administration, political theory, federalism and more broadly of European studies, international law, ethnic studies, political economy and the wider social sciences.