While many previous authors have told parts of this story, Bagley has recast it in its entirety for modern readers. Drawing on research he conducted for the National Park Service’s Long Distance Trails Office, he has woven a wealth of primary sources—personal letters and journals, government documents, newspaper reports, and folk accounts—into a compelling narrative that reinterprets the first years of overland migration. Illustrated with photographs and historical maps, is the first of a projected four-volume history, This sweeping series describes how the “Road across the Plains” transformed the American West and became an enduring part of its legacy. And by showing that overland emigration would not have been possible without the cooperation of Native peoples and tribes, it places American Indians at the center of trail history, not on its margins.