By 1957, the year Cornplanter's last direct descendant (Jesse Cornplanter) had died, the Cornplanter Tract had only a seasonal population.
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Historically the reservation was adjacent to the Cornplanter Tract, a 1500-acre perpetual land grant given to Seneca chief Cornplanter and his descendants that extended into Pennsylvania.
Both the Cornplanter Tract and the western portion of the Allegany Reservation were flooded and mostly made uninhabitable as a result of the construction of the Kinzua Dam; the Senecas were compensated mainly through the construction of Jimerson Town and a handful of other resettlement areas.
That year he commanded the military escort to Native Americans, including Chief Cornplanter, at the Treaty of Fort Harmar near Marietta, Ohio.
Frederick Starr commissioned Cornplanter to illustrate Iroquois Indian Games and Dances, a book depicting Iroquois life.
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Because he left no heirs, his death officially marked the expiration of a treaty granting Cornplanter's heirs a perpetual Pennsylvania land grant along the Allegheny River; seven years later, much of the tract would be flooded as a result of the construction of the Kinzua Dam.