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What if the Candian Rebellion of 1837 was won? For this POD there was some kind of British atrocity which conveniently happened at the start of the rebellions which acted as a rallying cry to gather support, and the US militarily backed the rebels as well. By late 1838/early 1839 Upper and Lower Canada gained independence (with British recognition) under the protection of the US, and it'll request annexation shortly before Texas does.
How would this effect Northwest Territory and Rupert's Land, Oregon territory, the Atlantic provinces, The Mexican-American war, Alaska, the Civil War, the number of states in the southwest (I'd assume there would be a slave south California), the division of Texas, and the modern day?