Any others you want to revisit? Maybe the treaty of Guadalupe-Hidalgo? How about 1812? Should America get to annex Canada? America did lose the war of 1812 after all!

If breaking a treaty is in best interest and situation permits it, it will probably get broken. Annexing Canada is not very practical at this point is it? Breaking a bunch of treaties made with Native Americans, sure why not.

If one day situation permits it, Canada will become 5X US state.

Sure if you use your imagination and a pathological attitude anything can happen!

The laws of physics are inflexible.

The laws of man, including international law, treaties and borders, are made up and can be change with enough will or force.

I mean of course they can but that doesn’t mean it’s the right thing to do, or even productive towards a country’s ends, or beneficial to then international community. Peace relies on honoring agreements. If you see countries start breaking their obligations, stand back and go “whelp that’s guns for ya” I’d call that a pretty regressive take on international relations.