This is likely popping up now because of the NYT's interview with Mark Carney, in which he admits that Canada has made plans to counter a U.S. invasion[1].

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  “I think you have a responsibility in these roles to look at extreme tail risk,” said Mr. Carney, a former central banker for Britain and Canada who approaches the world by meticulously assessing worst-case scenarios and drafting responses. He added: “That’s just risk management. That’s not a base case, but it would be irresponsible not to” prepare."

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It has long been known that the U.S. regularly makes plans for invading Canada. They make plans for invading everything. Nobody should be surprised that Canada has made plans to counter. What's interesting is that a sitting Canadian Prime Minister is admitting to doing so in the present tense. That much is new.

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[1]https://www.nytimes.com/2026/09/23/world/canada/mark-carney-... or https://archive.ph/2Q1kn

Incorrect title since the link is only about the War of 1812. There were several other invasions of what became Canada, such as 1775, the Fenians, and the Pig War.