This book explores the tumultuous history of North American state-making in the middle decades of the nineteenth century from a continental perspective. Today’s political map took its basic shape in the continental crisis of the 1860s, marked by Canadian Confederation (1867), the end of the U.S. Civil War (1865), the restoration of the Mexican Republic (1867), and numerous wars and treaty regimes conducted between these states and indigenous peoples through the 1870s. This crisis transformed the continent from a patchwork of foreign empires, republics, indigenous polities, and contested no-mans-lands into the nation states of Mexico and the United States and the Dominion of Canada, an expanding, largely self-governing polity within the British Empire. Key to this process was the question of sovereignty, or the power to rule. Battles over sovereignty ran through the struggles waged not only by the nation states that came to dominate the North America, but also those that failed, like the Confederate States of America, and others—like the European empires and indigenous peoples—that came into conflict with the three main states. In light of the global turn in 19th-century historiography, this book examines these political crises as an inter-related struggle to redefine the relationship of North Americans to new governments. This volume brings together distinguished experts on the history of Canada, indigenous Americans, Mexico, and the United States to re-evaluate an era of political transformation that has had profound consequences for the future of the continent.