I hear they have wigwams.
Check. Humor aside for a moment, I think it takes more than one party to perpetuate generations of bloodshed and hatred that exists between two or more parties. There are no innocent parties -- only parties that each believe in their own righteousness.
That said, Canadians could come in armed RVs, bearing beaver pelts and bazookas, and declare my home -- something I've paid several generations of property taxes on (it sure feels like it) -- as their new military headquarters for their conquest of the U.S.A. And I'd be pissed as hell. But the paper title to my house would mean sh*t. And while I'd personally try to fight for it back, I don't see that as America reclaiming
their land.
Afterall, a bunch of white guys took out a bunch of Spanish-armed Mexicans to own it before that, who stole it from Native Americans before that, who likely stole it from other tribes if not eskimo migrants before that... and before that the hills were likely part of the moving North American tectonic plate along the sea floor where brachiopods owned it before that, and prior to that it was a molten ball of lava... and...
So no. I would not see that as America reclaiming
their land.