American territorial borders have undergone significant and unparalleled changes in the last decade. They serve as a powerful and emotionally charged locus for American national identity that correlates with the historical idea of the frontier. But the concept of the frontier, so central to American identity throughout modern history, has all but disappeared in contemporary representation while the border has served to uncomfortably fill the void left in the spatial imagination of American culture.

This book focuses on the shifting relationship between borders and frontiers in North...