The first chapter introduces and outlines the project of the book. As a point of departure, it discusses the logic of the nation-state and explains why this ideal is fundamentally unrealistic and, therefore, inadequate as a principle for political organization. Contra liberal nationalists, it argues that even where the “standard liberal package” is granted to all citizens, the nation-state remains intrinsically exclusionary and unjust. Moreover, the chapter discusses the limitations of existing approaches to national pluralism, including liberal multiculturalism and constitutional patriotism before laying out the ensuing research agenda. In order to recover an alternative to the nation-state, the book proposes to examine the theoretical relationship between nations and political organization prior to the rise of the nation-state in the early modern period. The chapter addresses both methodology and source selection.