Are you a history buff? Are you looking for an innovative way to teach about U.S. expansion in the 1700s and 1800s? Do you like awesome things? You’re gonna love this visualization of U.S. expansion in North America from 1700 to 1900 then!
The expansion is seen through changes in the spatial distribution of post offices throughout the country. The data is from the USPS Postmaster Finder, with lat/long coordinates extracted from placenames through correlation with the USGS Geographic Names Information System. You can check out this video in HD and other great visualizations at derekwatkins.wordpress.com/2011/08/06/posted/.