Yeah, I'm not as smart as I used to be, but Trump's interest in Greenland kinda creates a conspiracy theory, I think that it contains the 6th largest Uranium deposits and 2nd largest deposit of rare earth metals.
If he's playing for energy independence and strategic mineral independence, then Greenland becomes key because the only countries that could fight the US military (not win but fight) are China and Russia, and they already have their own access to rare earth metals.