Think about the North Pole and the north seas. Looking at a 2D map it seems unimportant but if you look at a globe you can see how Greenland would be strategically important to the entire northern hemisphere. It’s easier to reach any country from the North Pole than laterally across continents.
Also it has rare minerals and the like.
We don’t have to own it, just get them to align with us. Trump said he won’t rule out military but that doesn’t mean he would use it. He just doesn’t think it’s wise to take gambits off the table when negotiating. You never know which way things will turn especially if Russia or China decide to make moves. But he obviously thinks it’s important for the future.
Trump is talking about a lot of things to realign order, particularly the Americas. He wants an economic union with Canada to make totally free trade and currency parity. That’s a good idea. He wants to control the Panama Canal. And he wants to stretch our reach and reduce strike time.
China decide to make moves
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Already has with a $150 billion dollar ‘investment’.