Sure, for some countries it will hurt short term, but long term they will all just increase trade between each other and do perfectly fine.
China’s exports to the US are only 7% of their GDP. Even if all that went to zero, they’ll still have the highest GDP soon enough.
And the EU has free trade in it's DNA.
The EU roleplays as free traders (for exports), but if you look at their actual behaviour (particularly around agriculture) then you can see that they're also a big fan of protectionism at times.
https://www.reuters.com/business/autos-transportation/eu-vot...
I mean, sortof. Unfortunately both the EU/China/everyone else has been running an export led growth strategy which relies on the US consumer buying their exports.
So, buckle up everyone, it's gonna be a wild ride (and maybe read Trade Wars are Class Wars to understand where the administration may be coming from).