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Re:US Territorial Expansion: 200 years mapped with d3/HTML5 by poezn on Thursday October 25, 2012 @03:43AM (#4696708)
The maps were originally created as GIS Shapefiles and then exported as GeoJSON.

D3 provides handy functions (d3.geo) to project GeoJSON files to reasonable looking maps.

You can find all original assets (Creative Commons licensed) here: http://poezn.github.com/us-history-maps/

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