Americans have benefited much more from free trade with Canada than our country has in free trade with them. When the original Canada-US FTA came into force in 1989, Canada saw many branch plants  close as production shifted to factories in the US. If Trump wants to end NAFTA, fine, because as far as Canada is concerned, no deal would be better than a bad deal, and the end of that agreement might turn out to be blessing in disguise for us.