I know that this is insanely complex with everybody protecting their own economies, but I think this is where middle powers working together more strongly could help. Imagine that Canada, the EU, and Britain worked together as an economic NATO, where a tariff attack on one is a tariff attack on all. It would hurt the US much more to bully one of these economies.

Canada and the EU already have a trade agreement since 2016. The UK economy is about 1/5th that of the EU, not enough to move the dial, and they kind of went off in the opposite direction around that same time...

You'd need n^2 "NATO"'s then, because EU has implemented many really shitty policies too and someone would want to fight back against that too. UK may do the same.

And we already have an actual NATO example, where one member attacks countries around the world, one of those countries fights back, threathening to attack american bases even in europe if needed... and now other nato members might get involved in a war that was started by one of it's own members, that no one else really wanted, and side on the side of the agressor ( https://www.aa.com.tr/en/europe/nato-chief-reaffirms-allianc... ). To turn back into economics, what happens when EU declares an "economic war" against china, china retalites (by eg. banning exports of something we really need)... does canada go along and threathen it's own economy? Or do they form a new "NATO" with "everyone-else except EU"?