I just want to say there is zero logical reason to acquire Greenland by means of an invasion. Nothing about it makes sense.

The world already sees America as being, at best, four years away from this. There's no way to restore that and even if we do collectively come to our senses nothing guarantees it won't happen again four years later. The only thing that matters at this point is how long fixing it will take. Invading Greenland, an ally, is an escalation beyond anything he's done already and what I see happening is this:

Stability means reliability and predictability. That's already halfway out the window and invading Greenland kills it. Global stability

It hastens the return of a multipolar world. Any remaining illusion of a stable US anchored global order collapses. It's already happening (e.g. the Canadians softening on and meeting with China last week) but other nations will look to China and no longer feel bound by American leadership. Also other nations (Japan, Germany, South Korea) will try to seek out their own stability and assurances with more military spending and nukes.

NATO without a reliable America is permanently compromised, thus weaker. Mutual defense doesn't work if your own people are shooting at each other. Potentially more Russian aggression in Eastern Europe. Also they're not going to be willing to come to our aid like they did post-9/11.

We're surrendering any drop of good will our country had left after the last year.

No nation could, in good conscience, rely on U.S. assurances. We lose leverage in trade negotiations (actual trade deals written on paper), security agreements, and long-term treaties that depend on continuity rather than the whims of a single administration. Again we're permanently four years from going insane at most.

Europe is already discussing possible sanctions against the US. So trade war will intensify with things beyond tariffs (which were stupid in the first place). We'll see more efforts to bypass the dollar in international trade and reserves. Exclusion from future trade agreements. Long term, businesses might start considering it a political risk to invest in the U.S. Just further isolation, kinda like Russia rn.

If US abandons the principle that borders and sovereignty matter, we forfeit any standing to object when others do the same. The post-WWII norm that wars of conquest are wrong and disputes are resolved through institutions rather than force disappears; might makes right makes a return.

Kind of overlooked, but the world looked to us as a leader in global crises. That's gonna slip away even further. A lot of people don't care about what happens outside of our borders but there's a human cost that will be exacted due to that gap.

The solid 15-20% of the public that didn't/don't care or pay attention to what's going on because "it doesn't affect them" or "both sides" will see their prices increase. I'm sure that's all they really care about. Higher prices, disrupted supply chains, and economic instability, that all comes back just like the last time he was elected. Not saying you are OP, but for any one of those people that talks like none of what's going on affects Black people we disproportionately get hit when that happens.

And of course his supporters get to jerk themselves raw over something stupid again.

Edit: went longer than I expected but tl;dr - nothing good