Six Nations land cessions
The Six Nations land cessions were a series of land cessions by the Haudenosaunee and Lenape to Europeans during the late 17th and 18th centuries. They ceded large amounts of land, including both recently conquered territories acquired from other indigenous peoples in the Beaver Wars, and their own ancestral lands to the Thirteen Colonies and the United States.
Source: Wikipedia — Six Nations land cessions (CC BY-SA 4.0)