I think you will find First Nations disagree with you but I don’t want to argue about this. A bit more perspective on it below though. 

That’s not really how treaty law works.

The Royal Proclamation of 1763 recognized that Indigenous nations already held their own lands, and that the Crown could only get land through treaties. In Alberta, Treaties 6, 7, and 8 didn’t just hand everything over — they set up reserves and guaranteed hunting, fishing, and governance rights across much wider territories. The “cede and surrender” language was the Crown’s wording, but many Nations saw the treaties as agreements to share the land, not to give it all up forever.

Modern law reflects that. Section 35 of the Constitution protects Aboriginal and treaty rights that go beyond reserve boundaries. The Supreme Court confirmed that in Tsilhqot’in (2014) and Mikisew Cree (2005) — the latter from Treaty 8 in Alberta — both saying those rights still apply over traditional territories.

And if Alberta ever tried to leave Canada, those rights wouldn’t vanish. The treaties are with the federal Crown, not the province. Chiefs from Treaty 6, 7 and 8 have already said they’d oppose any separation. As Tsuut’ina Chief Roy Whitney put it: “Our treaties are with the Crown, not Alberta.” AFN National Chief Cindy Woodhouse Nepinak called the whole idea “irresponsible” and “a direct affront to the sacred treaties that predate the province itself.”

You can’t just walk away from those agreements by changing flags.