Editing Heppner, Oregon (section)

=== Native American settlement ===
Native Americans lived and traveled along the land between the [[Columbia Gorge]] and the Blue Mountains for more than 10,000 years prior to European-American settlement. Ancient petroglyphs have been found approximately 45 miles (72&nbsp;km.) north of Heppner in Irrigon and Boardman.<ref>{{Cite web|url=http://www.co.morrow.or.us/planning/page/columbia-river-heritage-trail|title=Columbia River Heritage Trail|website=Morrow County Oregon}}</ref> In 1855, the U.S. Government and the predominant tribes in the region—the Cayuse, Umatilla, and Walla Walla—signed a treaty whereby the tribes gave up, or ceded, to the United States more than 6.4 million acres in what is now northeastern Oregon and southeastern Washington.<ref>{{Cite web|url=http://ctuir.org/treaty-1855|title=Treaty of 1855|website=Confederated Tribes of the Umatilla Indian Reservation|publisher=Cayuse, Umatilla, and Walla Walla people}}</ref>