The catalyst for this book is the fact that noted sociologist Charles Tilly, upon his death in 2008, left one completed chapter of an unfinished manuscript entitled Cities, States, and Trust Networks, examining the relationships between cities and nation-states over the sweep of history, and in particular the role of trust networks in mediating this relationship. Though this was the catalyst, the book serves a broader purpose: to survey recent frontier work on cities, nation-states, and the relations between the two in historical and contemporary perspective. Essays in the book will address four main themes: city-state relations, trust networks and commitment, democracy and inequality, and the importance of historical legacies in shaping state structures, practices, and capacities. They will be global in scope, with research on the United States, Latin America, Europe, Asia, and Africa; a number of the pieces will be comparative. They will also be interdisciplinary, including works of geography, history, political science, sociology, urban planning. The book addresses several confluent needs of readers. One is to simply update themes addressed in earlier edited work such as Bringing the State Back In (1985). A second is to bring together current thinking about cities on the one hand and nation-states on the other, literatures that are often segregated from each other. A third is to perform those two purposes in a way that is global in scope and combines both historical and current analyses, to pull together insights from the full range of human experience.