Online maps of political boundaries abound, and one of the web directories or portals mentioned in "Online Portals to Maps" (LOC American Memory, Perry Castañeda Library) may provide what you need with just a few clicks.
Historical Maps
Historical Maps
North America Map Archive
part of the Mapping History Project at the University of Oregon. Maps may require Shockwave plug-in to be viewed. Some interactive features.
Mapping History Project
From the University of Oregon - "interactive and animated representations of fundamental historical problems and/or illustrations of historical events, developments, and dynamics."
The David Rumsey historical map collection has over 41,000 maps and images online. The collection focuses on rare 18th and 19th century North American and South American maps and other cartographic materials. Historic maps of the World, Europe, Asia, and Africa are also represented.-- from the website
The American Memory Project features "Americana and Cartographic Treasures of the Library of Congress. These images were created from maps and atlases and, in general, are restricted to items that are not covered by copyright protection." - from American Memory Project site
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