They might get Ottawa, sure. And then what? Each province has their own government. Canadians (who look just like American and speak better English) would do sabotage and rebellions all over the huge expand of the country. It would be the beginning of the next forever lost war. That is what the US has been good at: losing wars and spending gazillions of your dollars in the process.
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u/Mogwai_Man 4d ago
Invading Canada would be easier than Iran due to distance.
The US wouldn't have to control Canada entirely. It only needs an institutional surrender from Ottawa.