Claim: A portion of the Syilx people (a roaming group of people) was reorganized under Chief Tonasket (whom a city in Washington was named after).
Evidence: The Okanagan people, also spelled Okanogan, are a First Nations and Native American people whose traditional territory spans the Canada–US boundary in Washington state and British Columbia in the Okanagan Country region. They call themselves the Syilx (Salish pronunciation: [sjilx), a term now widely used. The Okanagan people employed an adaptive strategy, moving within traditional areas throughout the year to fish, hunt, or collect food, while in the winter months, they lived in semi-permanent villages of kekulis, a type of pithouse. When the Oregon Treaty partitioned the Pacific Northwest in 1846, the portion of the tribe remaining in what became Washington Territory reorganized under Chief Tonasket as a separate group from the majority of the Okanagan, whose communities remain in Canada. It is named after Chief Tonasket of the Okanogan people, a local leader from this area who assumed the status of grand chief of the American Okanogan after the drawing of the Canada–United States border by the Oregon Treaty of 1846, assuming a leadership role in Okanogan territory formerly held by Chief Nicola who lived north of the border.