There are a lot of ways to prepare for an invasion. They range from the personal (stock up on food, find a safe place) to the societal (arm yourselves, prepare defenses, organize militia or resistance cells).
Nobody is denying the US would flatten Greenland but they can make governing the people impossible. Thats the point of resistance.
How exactly does one prepare for invasion?
There are a lot of ways to prepare for an invasion. They range from the personal (stock up on food, find a safe place) to the societal (arm yourselves, prepare defenses, organize militia or resistance cells).
Nobody is denying the US would flatten Greenland but they can make governing the people impossible. Thats the point of resistance.
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In Greenland specifically, it means staring wistfully out at the ice and ocean and considering your life choices.