If you aren't looking forward to the North American Union, here's an explanation of why Canada, yes CANADA, might be a problem.
You see, their rights come from the government. All things not expressly granted to the subjects are reserved for the Canadian government(s).
Yes, subjects. They never obtained their freedom from the British Empire...
If you've ever talked with a fan of their medical system and its fairness, you know what I mean.
Would any of it make a good 51st or 52nd State? I'm not sure!