Trump is using blackmail for foreign policy. I predict he's going to do so with Denmark and the EU from NATO, Tariffs, and everything in between to get them to give up greenland. Trump isn't a deal maker, as his past experience has proven. He just knows how to take advantage of people.
My guess is Trump continues to threaten American allies with tariffs and other acts to get them to capitulate to him. In the short term, billionaires will only become wealthier while middle class continues to decline. That's how capitalism and exponential growth works. Unless you find a way to limit exponential growth, you'll end up with oligarchs who control the country with money. The US has been heading that way for a while.
I do believe Trump will succeed with Greenland. Force the EU and Denmark to give up its control. You could pay every citizen of Greenland millions of dollars and still get Greenland on the cheap. It would be larger than the Louisiana purchase. No doubt Trump wants the credit. In 50 years after much of the ice has melted thanks to global warming, US will have reign over the sea transit from Europe to Asian. Let's not forget about all the precious minerals in Greenland. It may take 20-30 years to develop the infrastructure. It's also within bombing range of Northern Russia.
So, long term it would work out great for the US. I wouldn't doubt US controlling Greenland by the end of Trumps term. He said no new wars, yet we have a trade war 2 weeks in.
How to exploit all this financially, is more difficult for me to get a hands on.