Likewise, you could say that NYC and LA should singularly secede from America by that same logic.
It doesn't track. There is no legal precedent. Alberta as an entity did not exist beyond Canada.
Legal precedent doesn't really matter here. If Alberta wants to leave and they're willing to fight a war over it, then that's up to them. USA already went through this once.
U.S.A. ''life, liberty, and the pursuit of happiness''
Canada ''peace, order, and good government''
Those are fundamental to the identity of each nation's people. Are they core beliefs of the majority of their citizens? Probably. Are Canadians ready to fight a civil war over Alberta separatism? Not at this point, even slightly.
In order to draw the statement and comparison you just have, you have to throw out ALL legal and historical fact. And also decide that the rights of the Aboriginal land owners in Alberta mean absolutely nothing.
I don't know what it's like to be American, but I presume that not even they would be on board with wholesale land confiscations on such a massive scale. Sets a bad precedent, doesn't it?