Invading Venezuela is not even remotely the same thing as invading a fellow NATO country, and most Americans know it. If Trump tries to invade, he'll trigger a domestic crisis. i.e. Will congress block it? Will the military obey orders? How severe will the protests be?
If Trump quells all that and his invasion goes ahead, he'll trigger an international crisis too. Does NATO simply implode, or do the EU and other former-NATO countries form an anti-U.S. alliance? What kind of insurgency forms in Greenland? Does what's left of the old world order turn against the U.S. with economic sanctions? Does China take advantage of the moment to finally invade Taiwan? How loudly will Putin be laughing during all this?
We can only hope Trump is merely trying to distract people from the Epstein files with a bluff.
Regarding an 'invasion' of Greenland, it would actually be done in a day, and I highly doubt an effective insurgency would form. The US already has military control over the territory, and the population is way too low and concentrated to offer opposition.
This is implicit in the reaction of the EU: If the US takes over Greenland, Europe will close down all American bases in Europe.
This is what makes this particular foreign policy so incredibly stupid: The US already gets everything it needs from Denmark/Greenland. The US is considering throwing away European allies to have their flag be bigger on a world map.
If Trump does something it will be the same as with Venezuela. This invalidates most of your pointed questions against it happening.
These questions would at most be raised after it already happened, and after watching a few political influencer like Zack who routinely gets 50k+ viewers I suspect your trust in "most Americans know the difference" to be exaggerated, sadly.
This scenario also strongly reminds me of an old fable from the Middle ages, where the king reassures the peasant that the noble will be punished if he kills the peasant... But what meaning does such a punishment have for the peasant who'd be dead?
So yeah, there will be political fallout once Trump's invades it's ally Denmark, at it will invalidate NATO entirely. But does that matter to the annexed people? They'll still have lost their sovereignty to be exploited by American mega corporations.
Take a second look at Venezuela. Congress passed an act limiting Trump's ability to operate in the country. The U.S. is currently not occupying or controlling the country. They have not effected regime change. The former VP has taken over and may take some pro-U.S. actions due to threats of being kidnapped but, with Maduro gone, she could be replaced at any moment. Meanwhile, U.S. oil execs are balking at doing anything in Venezuela and all Trump can do to keep Venezuela on the front page (instead of the Epstein files) is continue pirating oil tankers.
Venezuela could realistically come out of this with their sovereignty intact and no significant U.S. takeover of their oil industry materializing. If anything, the lesson we should learn here is that Trump is so inept that, should he try to take over Greenland, he may trigger all the negative consequences of doing so without actually accomplishing much of anything. Someone living in Nuuk, far from any American military base, might be forgiven for not noticing when they wake up in an American territory. A couple of leaders might get a promotion and the cheques may start coming from Washington rather than Copenhagen, but the Americans may have no interest in governing Greenlanders and American mining companies may refuse to get bogged down in another one of Trump's swamps.
If Trump quells all that and his invasion goes ahead, he'll trigger an international crisis too. Does NATO simply implode, or do the EU and other former-NATO countries form an anti-U.S. alliance? What kind of insurgency forms in Greenland? Does what's left of the old world order turn against the U.S. with economic sanctions? Does China take advantage of the moment to finally invade Taiwan? How loudly will Putin be laughing during all this?
We can only hope Trump is merely trying to distract people from the Epstein files with a bluff.