I want to know the answer to the following question:
What did the treaty establish?
All the background I'm provided with is that "In 1855, Washington Territorial Governor Isaac Stevens negotiated the Hellgate treaty between the United States Government and the Salish, Pend d'Oreille, and the Kootenai people of western Montana, which established boundaries for the tribal nations.". Is that enough to answer the question?
Answer: no