> I support the US assuming control of Greenland because it would be incredibly economically beneficial to the US, militarily beneficial to the US
You immediately lose all of your NATO allies, and have the potential for an immediate war with not only all of them but also all the non-NATO members of the EU, which includes two independent nuclear powers, and who hold enough assets to cripple your economy without even firing a shot: both by fire-sale of bonds and other assets, and even just by ceasing trade with you.
China and Russia both have immediate and huge opportunities in both a hot war and an economic blockade. Of the two, I wouldn't put it past Russia to even attempt to use a nuke as a false-flag attack in this scenario, in either direction (US <-> former allies) or both directions. It would be really really stupid of them, but Putin's already shown consistent stupidity, so that's not enough to discount it.
You immediately lose all of your NATO allies, and have the potential for an immediate war with not only all of them but also all the non-NATO members of the EU, which includes two independent nuclear powers, and who hold enough assets to cripple your economy without even firing a shot: both by fire-sale of bonds and other assets, and even just by ceasing trade with you.
China and Russia both have immediate and huge opportunities in both a hot war and an economic blockade. Of the two, I wouldn't put it past Russia to even attempt to use a nuke as a false-flag attack in this scenario, in either direction (US <-> former allies) or both directions. It would be really really stupid of them, but Putin's already shown consistent stupidity, so that's not enough to discount it.