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A map of the United States that shows 'free states,' 'slave states,'... News Photo1850-1859,Appearance,Archival,Black History in the US,Book,Color Image,No People,North America,Politics,Showing,Slavery,USAPhotographer Collection: Archive Photos 2006 Getty ImagesA map of the United States that shows 'free states,' 'slave states,' and 'undecided' ones, as it appeared in the book 'American Slavery and Colour,' by William Chambers, 1857. (Photo by Stock Montage/Getty Images)