What would realistically / actually happen if Trump invaded Canada and / or Greenland, Mexico, Panama, etc?

As an aside, and based on this post:

[From the article]

Thule Air Base thus remains indispensable to American defense, and the United States remains very interested in Greenland – and committed to maintaining good relations with Denmark.

Please note that the last hyperlink in the article takes you to a page on the U.S. Embassy & Consulate in the Kingdom of Denmark website …

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Which I find utterly charming :wink: