The West Virginia. Cyclopedia
Treaty of Pittsburgh
In 1775, Virginian John Connolly negotiated the Treaty of Pittsburgh, specifying the Ohio River as a Native American boundary. In return, the Shawnee, Delaware, Mingo, Seneca, Wyandot, Potawatomi, and Ottawa tribes pledged neutrality and peace.
But soon after the start of the American Revolution, in June 1777, British negotiator Henry Hamilton met with tribal leaders at Detroit and gained the support of the Chippewa and Ottawa as well as some Mingo and Wyandot. This agreement nullified the Treaty of Pittsburgh and effectively brought most Native Americans into the war on the side of the British.