In January, Trump threatened to use “economic force” to annex Canada.
Archived version: https://archive.is/20250327161332/https://nationalpost.com/news/politics/federal_election/americans-auto-tariffs-mark-carney-donald-trump
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Keep in mind how the US tends to split when voting. Both sides of the country tend to separate from the middle, where land votes.
I’d bet you can get 10 consecutive states from Canada on both sides through Washington/Oregon/Cali and New England down the coast a bit.
Michigan and Minnesota. With California and NY (50/50) state, GDP of Canada could be higher than remaining US.