Why did Indians in the NW Territory go to war with the US.

The Northwest Indian War (1785–1795), also known as the Ohio War, Little Turtle's War, and by other names, was a war between the United States (along with its Native Chickasaw and Choctaw allies) and the Western Confederacy (a confederation of numerous other Native American tribes), with support from the British, for control of the Northwest Territory. It followed centuries of conflict over this territory, first among Native American tribes, and then with the added shifting alliances among the tribes and the European powers of France and Great Britain, and their colonials. The United States Army considers it their first of the United States Indian War of the Treaty of Paris, which ended the American Revolutionary War, used the Great Lakes as a border between British territory and that of the United States. Numerous Native American peoples inhabited this region, known to the United States as the Ohio Country and the Illinois Country. Despite the treaty, which ceded the Northwest Territory to the United States, the British kept forts there and continued policies that supported the Native Americans. With the encroachment of European settlers west of the Appalachians after the War, a Huron-led confederacy formed in 1785 to resist usurpation of Indian lands, declaring that lands north and west of the Ohio River were Indian territory. President George Washington directed the United States Army to enforce U.S. sovereignty over the territory. The U.S. Army, consisting mostly of untrained recruits and volunteer militiamen, suffered a series of major defeats, including the Harmar Campaign (1790) and St. Clair's Defeat (1791). About 1,000 soldiers and militiamen were killed and the United States forces suffered many more casualties than their opponents. These defeats are among the worst ever suffered in the history of the US Army.

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