 The Coeur d'Alene people once inhabited in northern Idaho, Washington, and Montana, but today, the only land controlled by the tribal nation is the Coeur d'Alene Reservation in Benewah and Kootenai counties, Idaho.In 1853, the territorial governor of Washington (which at the time included the panhandle of Idaho), Isaac Stevens, began to negotiate treaties with local tribes.By 1855, Stevens had treaties with most of the tribes in the area, but not including the Coeur d'Alene tribe.