Criticism from "Reason" about Trump expansion suggestions
https://reason.com/2025/05/04/what-if-the-president-tries-to-annex-greenland-and-canada/
LONG and goes into a lot of detail. Claims at the end that Trump can't get a deal to acquire territory without bloodshed.
I'm thinking the author looks too narrowly at the situation. Effective control doesn't necessarily require occupation.