American Victory in Quebec

The actual conquerors of Canada i.e. the Revolutionaries in Quebec, might have a say in that. They wouldn't be looking to hand it back.
Some of the habitants will be sympathetic, or at least not anxious to give New France back to Britain. You'd have to have France recognize the Revolution earlier (taking Quebec might do that ) and have the French fleet sail for America sooner, at least to "take an interest" in the affairs of the French in Quebec.
 
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