Cover design by Richard Ljoenes.
Cover images: Map courtesy of the Library of Congress. Top: The Arrival of Captain Lewis at the Great Falls of Missouri, courtesy of the artist, Charles Fritz. Bottom: Trestle at Promontory, by Andrew J. Russell, from photographs taken during construction of the Union Pacific Railroad, Beinecke Rare Book and Manuscript Library, Yale University.
Maps following the cover image, “Establishing the Union, by Means of WOOD, EARTH, and WATER” and “Consolidating the Union, by Means of FIRE and METAL,” © 2013 Springer Cartographics, LLC.
Title page image: “The ‘The Good Roads Train,’” courtesy of Project Gutenberg.