They have the power to stop this

I'm really sorry if this is a stupid question, but I've been wondering.

Against countries with a giant military, sanctions seem to be a primary way for the rest of the world to react whenever they overstep some line. But that probably requires some strong trade between countries.

So I've been wondering if Trumps tariffs might be an attempt at isolating the US from global trade to be less impacted by future sanctions if he decides to do anything radical. (idk, take over Greenland, become straight up authoritarian,...)

I’m not sure I want to hit bottom to find out where all this leads.