U.S. History: Maps

Civil War: from Hargrett Rare Book & Manuscript Library, University of Georgia
Civil War : from the University of Alabama
David Rumsey Map Collection
Goff’s historical map of the Spanish-American War: from Library of Congress
Historical Map Archive: from the University of Alabama
Indian Reservations: west of the Mississippi River, zoomable, from Library of Congress
Indian Tribes: west of Mississippi River, 1854, zoomable, Library of Congress
Map Collections: 1500-2004, from Library of Congress
Maps: from the Perry-Castaneda Library Map Collection
MapMachine: by National Geographic Society
Mexican-American War: from the University of Alabama
Migration Routes: Oregon Trail, Santa Fe Trail, California Trail, from Library of Congress
Minorities:  thematic map, 2010, from U.S. Census Bureau
Old Maps: collection in the Library of congress
Panoramic Maps: collection in the Library of Congress
Pony Express Route: map, April 3, 1860-October 24, 1861, from CPRR Museum
Printable Maps: black and white maps suitable for printing, from National Geographic
Railroads: 1828-1900, from Library of Congress
Railroads: from the University of Alabama
Territorial Maps: of U.S., 1775-1920, University of Virginia
Territory of the United States: Mississippi to the Pacific Ocean, 1854, Library of congress
Thematic Maps: from U.S. Census Bureau
Trails of Hope: Overland Diaries and Letters, 1846-1869, downloadable  maps, from Harold B. Lee Library
Transportation: from Hargrett Rare Book & Manuscript Library, University of Georgia
Two Centuries of US Immigration: animated map, from Metrocosm
Vitality Maps: causes of death from disease, 1870 census, from David Rumsey Collection
Western Territorial Expansion: 1803-1898, from Frontiers by Library of Congress