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With a POD no earlier than 1763, incorporate Canada into the United States, or another independent nation that commands the entire Atlantic Coast from Georgia to Quebec (obviously, with an early POD, this nation might have a different form).

I'm entirely aware that the US arbitrarily annexing Canada is an old AH cliche, but it seems to me there should be a plausible way for Canada to join. Obviously the best outcome is if Canada joins voluntarily. A likely solution is a change before the American Revolution, hence my setting the POD to the end of the French & Indian War.

One possibility is a delayed American Revolution, possibly including some British concessions that stop things from boiling over in the 1770s. This delay is long enough for Canada to develop an identity that has more in common with the original 13 Colonies, along with locally-run colonial governments, and for the Americans to accept Canadians (including the Quebecois) as part of them. When a later crisis does spark a revolution, Canada joins the other colonies. I think a delay to around 1790 would be enough, giving Canada an entire generation under British rule before the Revolution.

Another possibility is that the American invasion of Canada during the Revolution succeeds. The most plausible approach I can come up with is that the British implement harsher policies in Quebec in the years leading up to the Revolution, possibly including no Quebec Act, which in turn provokes a Quebecois uprising. The tricky part might be getting Quebec to join with the Continental Congress rather than seeking to return to French rule. That could be solved by Congress offering to grant Quebec the privileges they wanted, which would be a purely political maneuver cloaked in rhetoric. Maybe Adams or Jefferson is dispatched to Quebec as an emissary? I could even see "the suppression of free worship in Quebec" as one of King George's offenses cited in the Declaration of Independence (the invasion of Canada was in late 1775, which might just be enough time for the Canadian colonies to send representatives to Philadelphia).

If so, my quick reading of the organization of colonial Canada suggests that Canada would not join as a single state, but as three: Nova Scotia (including OTL New Brunswick and Prince Edward Island), Newfoundland, and Quebec. Butterflies would probably result in a slightly different organization of Canada as the US expanded to include western and northern Canada. And as all Canadian states would presumably be free states, the buildup to the Civil War could go completely differently (including butterflying it away, although that would be a tall order).

The American Loyalists who emigrated to Canada en masse after the Revolution IOTL would have to go somewhere else. They might just return to Britain, or they might head to another colony, which would see a population surge. The West Indies? South Africa? Australia?

The biggest butterfly might be the reaction to the French Revolution. The presence of a large Francophone population in the United States might push the US into outright alliance with France. Once that happens... well, anything is possible. Side question: would Britain have had a reliable source of timber for shipbuilding after the loss of North America?
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