[incomingpain]

>Why is the USA forced to invade Canada?

If it can get federal control over greenland it doesnt need to take Canada. The case where Canada must be annexed is if Greenland somehow remains part of Denmark.

[lumost]

>The case where Canada must be annexed is if Greenland somehow remains part of Denmark.

How does this follow? The US/Canada have previously made numerous mutual defense and land concession deals for joint infrastructure projects and defensive purposes. It's been USA policy for 150 years not to allow foreign interference in the Americas, and potential for Mexican or Canada to be used as grounds for continental attacks on the USA has been the cause of several pre-emptive wars.

If the US desired a military port in the arctic, such a deal could assuredly be negotiated again. As Canada's #1 trading partner, we also have significant leverage on negotiating mineral access and equitable property rights.

What does inheriting Canada's internal challenges including Quebec Succession discussions grant the USA? What makes the US "need" to own Canada?