Denmark has allies and America, for the time being still has elections.
They don't need to defend Greenland from the American military. Capturing Greenland by military force will be wildly unpopular with Americans.
Hence why Trump has backed down on that idea.
Only a retard thinks that Greenland would be taken by military force. Retards listening to retarded sensationalistic media which keeps posing the question, when it's so farfetched.
There was no backing down because he never said that's what they'll do. You get that if a bunch of US ships carrying soldiers showed up to Greenland not a single shot would be fired?
What's really in question is the international recognition of the territory as US