A history of travel in America being an outline of the development in modes of travel from archaic vehicles of colonial times to the completion of the first transcontinental railroad: the influence of the Indians on the free movement and territorial unity of the white race: the part played by travel methods in the economic conquest of the continent: and those related human experiences, changing social conditions and governmental attitudes which accompanied the growth of a national travel system - Dunbar, Seymour (Tudor, 1937)