Northwest Indian War
1785 CE.
Shown on the map at 41.000°, -86.000°.
The Northwest Indian War was an armed conflict for control of the Northwest Territory between the United States and a loose confederation of Native American peoples who called themselves the United Indian Nations but are better known today as the Northwestern Confederacy. The United States Army considers the conflict to be the first of the American Indian Wars. Following centuries of conflict involving Native Americans and Europeans for control of the region, the lands comprising the Northwest Territory were ceded by Great Britain to the newly formed United States in the 1783 Treaty of Paris. The treaty used the Great Lakes as a border between British North America and the US, and led to the Americans assuming control over the Ohio Country and Illinois Country, which had previously been prohibited to European settlement.
Text from the Wikipedia article Northwest Indian War, licensed CC BY-SA 4.0.