The Annotated Constitution
(Library of Congress)

ON-LINE ENCYCLOPEDIAS AND OTHER REFERENCE WORKS:   

Houghton Mifflin's Reader's Companion to American History

Columbia Encyclopedia, 6th edition

Encyclopedia Smithsonian 

CIA World Factbook 

 

ON-LINE MAPS:

Maps of the United States
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National Atlases Based on Censuses of 1870, 1880, 1890
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Presidential Election Maps
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