Alberta and BC would the only one they'd want, and maybe Ontario, as the rest are bleeding money like mad and adding a money-sink like Quebec would probably bankrupt the USA.
But it's all wild conjecture because it's never going to happen. If nothing else, the First Nations would shut it down pretty quick because they've got a good thing with all the "settler guilt" in Canada, translating into billions of dollars a year, while the US doesn't give a crap and never has.