Interactive Time-Lapse Map Shows How the U.S. Took More Than 1.5 Billion Acres From Native Americans is the headline of a useful article in Slate that gives details about the impressive interactive called The Invasion of America: How the United States Took Over an Eighth of the World.

It’s a “must-see” and “must-use” site when teaching U.S. History, and is an excellent illustration of our country’s avarice.

I’m adding it to The Best Websites For Teaching & Learning About U.S. History.