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US Historical County/State Boundaries

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Published on Jul 13, 2012

30-second animation of the changes in U.S. historical county boundaries, 1629 - 2000. Historical state and territorial boundaries are also displayed from 1783 - 2000. The source for the background layer is the U.S. National Park Service.

This animation was created using data from the Atlas of Historical County Boundaries, a project of the William M. Scholl Center for American History and Culture at the Newberry Library in Chicago. The Newberry Library is one of the nation's premier research libraries. Principal funding for the Atlas came from the National Endowment for the Humanities.

The Atlas presents in maps and text complete data about the creation and all subsequent changes (dated to the day) in the size, shape, and location of every county in the fifty United States and the District of Columbia. The principal sources for these data are the most authoritative available: the session laws of the colonies, territories, and states that created and changed the counties.

The historical state and territorial boundaries displayed in this animation were generated from the historical county boundary data.

For more information, go to the Atlas of Historical County Boundaries Web site at http://publications.newberry.org/ahcbp/. This Web site provides interactive maps for all states. The Atlas data is also available on the Web site for download in shapefile format (for use with GIS software) and KMZ format (for use with Google Earth). Historical county maps are also available in PDF format.

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