Why?
Perhaps Canada is invading to secure a buffer zone (kind of like France's invasion of the Rhineland in the v1.0 T2K canon) after some kind of man-made or natural disaster (massive, terrorist offensive, long-term economic depression, severe drought and rising sea level due to global warming, all of the above...) has devastated the U.S.
Hundreds of thousands of U.S. refugees from the densely populated northeast and the midwest are flooding into Canada, putting added strain on its already hard-pressed economy/social services/law enforcement. With the U.S. unable (or unwilling) to stop the exodus, Canada launches a limited invasion to create a buffer zone (and to seize strategic assets within that zone).
It would be one of those "This hurts me more than it hurts you" type deals but there could be more aggressive/aquisitive elements in the CAF that want to push it as far as it can go.
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