"If Trump takes Greenland or any other country's land, I'll give it back

That's not really what happens, from what I've observed. I think once a policy has been woven into action, it's difficult to unpick all of the new dependencies and go backwards without wasting a tremendous amount pf resources. Most of what Trump has been doing is probably here to stay. The Democrats are super neutral on everything. there's almost nobody pushing to the left.

Trumps whole thing is throwing grenades and leaving others to deal with a fallout. No matter what happens with Greenland he's irreprably damaged the USs alliances everywhere. The possibility the US is fickle enough to invade an ally and then undo it in 4 years is insane. Any successor to trump that wants to backtrack needs to sort out the rampant unchecked power of the office, not to mention the lack of accountability at so many levels of the government.

if people had any balls at all, they would abandon the traitorous democratic party