What did Tecumseh do that threatened the us frontier?

Tecumseh, a Shawnee leader, sought to unite various Native American tribes against the encroachment of American settlers on their lands in the early 19th century. He believed that a confederation of tribes could effectively resist westward expansion and protect their territories. His efforts to organize and rally Native Americans posed a significant threat to the U.S. frontier, ultimately leading to increased tensions and conflicts, including the War of 1812. Tecumseh's alliance with the British during this conflict further heightened the fears of American settlers and government officials regarding the stability of the frontier.