Claims to self-determination are rife in world politics today. They range from Scottish and Catalonian campaigns for independence to calls for the devolution of power to regions and cities. But is self-determination meaningful or desirable in the twenty-first century, or merely a dangerous illusion? In this book, David Miller mounts a powerful defence of political self-determination. He explains why it is valuable and argues that geographic proximity alone is not enough for groups to have the capacity for self-determination: group members must also identify with each other. He explores the different political forms that self-determination can take, and he suggests some realistic constraints on how it