[MaxHoppersGhost]

Canada has a strong army and can defend itself. Greenland on the other hand is not well defended and I doubt Denmark really cares (e.g., if they’re willing to send tens of thousands of troops to die for it) if it was occupied by China or Russia in the event of a war.

Greenland is a massive strategic liability for the US and Europe (although the EU still has its head in the sand they are starting to wake up some).

[OkayPhysicist]

Frankly, the right move (before Trump did as Trump does, and fucked up our foreign relations) would have been to straight-up buy Greenland. The people of Greenland have the right under Danish law to vote for independence, and there's not that many of them. Paying individual people for the votes probably would have cost the US $10 billion, and then we could give them Puerto Rico-esque status.