No if the US was gonna invade it would be for Albertas oil fields.
Not that they would invade. They could just support Alberta and help foster the sense of alienation it feels from the rest of Canada. Entice it into joining the United States (a cowboy, hick, conservative province like that might go). Once Alberta goes the rest of Canada crumbles, then they can take in the alantic provinces for their new found offshore, manitoba and ontario for the hydro electricty then let Quebec do their own thing.
The United States energy problems for the next 50 years will be solved along with legit claim to the NWP (thanks to incorporating canada into the Union).
Point Match Game, America. Hurray for fiction.
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Bode - 100 Holy Paladin - Lightbringer