Tecumseh (Shawnee, 1768--1813) was a vital figure in the Native American resistance to U.S. expansionism after the Revolution. A warrior chief from the Ohio Valley, he worked to build a coalition of Indigenous nations that would block white settlers from encroaching further west. In the War of 1812 (1812--15), Tecumseh strategically allied his forces with the British but was killed by U.S. troops in the Battle of the Thames. The future president William Henry Harrison, who led that pivotal battle, recognized the formidable challenge Tecumseh's coalition would have posed to the United States, calling him, "one of those uncommon geniuses, which spring up occasionally to produce revolutions."