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https://github.com/lmullen/historical-us-boundaries

Map of changing US political boundaries in D3.js
https://github.com/lmullen/historical-us-boundaries

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Map of changing US political boundaries in D3.js

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# Historical Boundaries of the United States

An [interactive map][] of how state and territory boundaries in the
United States changed over time. The underlying data is from John H.
Long, et al., *[Atlas of Historical County Boundaries][]*, Dr. William
M. Scholl Center for American History and Culture, The Newberry Library,
Chicago (2010).

Lincoln A. Mullen | [email protected] | http://lincolnmullen.com

MIT License

[interactive map]: http://lincolnmullen.com/projects/us-boundaries/
[Atlas of Historical County Boundaries]: http://publications.newberry.org/ahcbp/