USA is on a path of isolationism (you'd think) yet curiously the big talkers run and hide around trade with China...or who's paying for "the wall". It makes perfect sense for Mexico and Canada to come together on trade and to divesify their mutal markets which will eventually squeeze the States until Trumps eyeballs pop out.
We have TPP to get into and now Euro free trade (whatever that is)...and China/India markets to develope.....trade depends on good agreements and stability....that is not where the States is at currently.....I also think retaliation is useless ....it's better to find new markets and  avoid doing business with the States in the future