Sigh!
I guess they didn't read the memo that the US formally recognised Greenland as Danish territory in 1917, when Denmark ceded the Danish West Indies to the US.
Danish territory meaning that Greenland is not a mere piece of real estate, but rather a self-governing part of the Kingdom of Denmark. In essence, Greenland operates as a nation with its own government, while remaining constitutionally tied to Denmark. Should Greenland seek full independence from Denmark, this would require an agreement between the Greenlandic and Danish governments, the consent of both parliaments, and ultimately approval through a referendum in Greenland.
