When Congress stopped doing its job.

The entire US government is corrupt at this point. Both sides back down as soon as their money is threatened and republicans cower in fear every time they second guess their glorious leader. But to answer your question, the Supreme Court of the United States decided Trump can do whatever he wants and they will only fight him when they need to pretend they are impartial. They gave Trump the power over tariffs about a month before his "liberation day."

At the end of the day it really comes down to the fact that nobody in the entire government of the US has the balls to tell the big baby in charge "no." And even when they do they only do it to win political points so they look good for the next election.

They don’t. Everything he does is by executive order which expires if congress doesn’t uphold it I believe.

It's because people are following such orders before they are nulled by courts or congress.

Seems some quirk of the Us american system. The whole world is wondering, too.

No, you only read the headlines apparently. The 1bn is only due if you want to be a member for longer than three years (other factors may turn that into a subscription extortion later down the line, but at this moment, Trump only wants to force the free trial period onto countries).

Not really many forces has been deployed, it’s more a political statement than deterrence.

EU leaders have made it clear they will open fire on hostile US soldiers.

I don't believe this part.

I'd rather think that normal civilians might shoot some of them, despite they are a very peaceful people.

No. They cancelled that and had an emergency meeting after Trump announced tariffs. They are caving because the same billionaires are gaining control of other countries

Incorrect. The American claim was that Denmark does not do enough to protect Greenland. The reaction to that was to increase the NATO presence on Greenland. Why this is being considered threatening behavior (when an ally does exactly what you ask of them) is because politicians want to play both sides of the argument. The hope is that every action can be spun in the press so they can get whatever outcome they please

The most depressing part is that everyone around him just goes along with this shit. His orders have no weight unless someone executes them.

″[Just] because the boat went there 500 years ago and then left, that doesn’t give you title to property.” It was not clear what “boat” Trump was referring to.

That line is even crazier. The Norse established a settlement in 986 in Greenland. The funny part is that the Thule people, the ancestors of the Inuit arrived later then them and replaced the Dorest culture on Greenland and then later the Norse as well. Obviously there is a fairly direct linkt between the Norse and Danes.

He has a peace price after all, so he must be an expert in peace stuff.

They just want a piece of the board (the biggest piece)

Well, we wouldn't want to send the actually good stuff away...

Well… only like 96% of that is a tax for Americans. But with the rest he sure showed France https://www.kielinstitut.de/publications/americas-own-goal-who-pays-the-tariffs-19398/