I totally get the sentiment... and I am mixed on the whole tariff strategy.  Mixed because I have no idea what it will do, and honestly it seems to me all the experts are convinced whichever way they lean politically.

That said... the world can boycott American goods for sure...  but as it stands today the US holds nearly all the cards.

Canadian exports to the US are about a 1/3rd of the CA GDP.  While the other way around it's something like 1.5%