This compelling exhibit from the Digital Public Library of America traces the history of maps in American culture, in the process making some very sophisticated arguments about how maps have shaped the history, economics, and psychology of the United States. Readers may explore maps and photos by theme, including Westward Expansion, The Rise and Fall of America's Forests, Depicting a Fractured Society: Civil War Maps, Travel and Tourism: Maps for Every American, and Moving Forward. There are a number of resources under each category, and each map or photograph is accompanied by a detailed textual explanation. This site is well worth a visit.