In such a future, Canada would be devoured like trout by a Grizzly....
One of the most hilarious aspects for me is that Canada is this wonderful safe haven for refugees and the fanatical Gilead people or militia groups tied to them would not have invaded or at least forced Canada into an agreement not to take this people, much less allowing them to serve as a base of operations for a resistance and media propaganda campaigns against them.
Same goes for Mexico, if America had transformed and could no longer offer aid or trade, Mexico would be completely economically ruined and a Mad Max society with the cartels in charge, not being wooed for life or death trade deals. Heh.