[Cronos]

Denmark can no more sell it than the USA could sell Alaska.

Greenlanders are Danish citizens.

[Jonty30]

And American citizens used to be British.

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[libh8er]

Maybe, but they are autonomous enough (since 2009) that if they choose they can become completely independent. As in independent of Denmark. If they can become completely independent of Denmark then they can also be persuaded to join the United States or enter some kind of alliance. It’s entirely up to the people of Greenland.