Final answer:
Tecumseh was killed at the Battle of the Thames on October 5, 1813, which led to the collapse of the Indian confederation he had helped to unify.
Step-by-step explanation:
The legendary Shawnee warrior Tecumseh was killed at the Battle of the Thames during the War of 1812. This battle took place on October 5, 1813, after the U.S. Navy gained control of Lake Erie, enabling General William Henry Harrison's forces to push into Canada, where they confronted the British and their Native allies. Tecumseh's death was significant as he was the unifying force behind the Indian confederation, which fell apart without his leadership. Eventually, this led to the diminishing of Native American resistance and opened up the Indiana and Michigan territories to white settlement.