It's the whole world vs the USA, Trump thinks trade wars are "easy" to win, he's about to get his ass kicked. I'm from Canada and we are slapping tariffs on American goods now too. It's going to get ugly, Trump has zero understanding of how the world economy works. Everyone gets hurt in a trade war, ask any economist
The issue is that with everybody playing tit for tat we are wasting time retaliating against idiocracy. The other world leaders are just as bad slapping on tariffs with no real plan to combat trumps bullshit. Trump is banking on everyone feeling the burn so when the time comes it will be for the world governments to enact new policy.
You have to retaliate, it's political suicide to just accept his bullying and do nothing.