The Salish peoples are indigenous peoples of the American and Canadian Pacific Northwest. The term “Salish” originated in the modern era as an exonym created for linguistic research. Salish is an anglicization of Séliš, the endonym for the Salish Tribes of the Flathead Reservation. The Séliš were the easternmost Salish people and the first to have a diplomatic relationship with the United States so their name was applied broadly to all peoples speaking a related language. The Salish (or Salishan) people are in four major groups: Bella Coola (Nuxalk), Coast Salish, Interior Salish, and Tsamosan, who each speak one of the Salishan languages. The Tsamosan group is usually considered a subset of the broader Coast Salish peoples.

Resource: https://en.wikipedia.org/wiki/Salish_peoples