[jcranmer]

Canada and Mexico signed the USMCA not so much because they felt it was better than NAFTA but because they didn't want Trump to do any worse. And it's not like Canada is happy about Trump's emergency steel tariffs that hit Canada's exports--the fact that USMCA would cause Trump to lift them was one of they reasons to sign it, and Trump certainly was in no rush to lift them afterwords.

Not to mention there's lots of dislike towards Trump's tendency to rip up treaties just because Obama signed them--Vietnam wasn't happy about Trump dropping TPP, Europe was not a fan of him leaving the Paris climate treaty or the Iran nuclear treaty, etc.