From the award-winning author of American Canopy, a dazzling account of the world’s longest road, the Pan-American Highway, and the epic quest to link North and South America, a dramatic story of commerce, technology, politics, and the divergent fates of the Americas in the nineteenth and twentieth centuries. The Pan-American Highway, monument to a century’s worth of diplomacy and investment, education and engineering, scandal and sweat, is the longest road in the world, passable everywhere save the mythic Darien Gap that straddles Panama and Colombia. The highway’s history, however, has long remained a mystery, a story scattered among government archives, private papers, and fading memories. In contrast to the Panama Canal and its vast literature, the Pan-American Highway—the United States’ other great twentieth-century hemispheric infrastructure project—has become an orphan of the past, effectively erased from the story of the “American Century.” The Longest Line on the Map uncovers this incredible tale for the first time and weaves it into a tapestry that fascinates, informs, and delights. Rutkow’s narrative forces the reader to take seriously the question: Why couldn’t the Americas have become a single region that “is” and not two near irreconcilable halves that “are”? Whether you’re fascinated by the history of the Americas, or you’ve dreamed of driving around the globe, or you simply love world records and the stories behind them, The Longest Line on the Map is a riveting narrative, a lost epic of hemispheric scale.

A standard track gauge—the distance between the two rails—enables connecting railway lines to exchange traffic. But despite the benefits of standardization, early North American railways used six different gauges extensively, and even today breaks of gauge at national borders and within such countries as India and Australia are expensive burdens on commerce. In Tracks across Continents, Paths through History, Douglas J. Puffert offers a global history of railway track gauge, examining early choices and the dynamic process of diversity and standardization that resulted. Drawing on the economic theory of path dependence, and grounded in economic, technical, and institutional realities, this innovative volume traces how early historical events, and even idiosyncratic personalities, have affected choices of gauge ever since, despite changing technology and understandings of what gauge is optimal. Puffert also uses this history to develop new insights in the theory of path dependence. Tracks across Continents, Paths through History will be essential reading for anyone interested in how history and economics inform each other.