New Ireland (Maine) - Wikipedia
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New Ireland: How Maine almost became part of Canada at the end of the War of 1812
'If British diplomats and strategic thinkers had been more strongly committed to this idea, a very alternative outcome is easy to imagine'
nationalpost.com
What if the British had not returned this territory at the end of the war? That could potentially sour the Anglo-American relationship some, but it's not like all of Maine was taken, just some more tracts of snow. Canada gets to extend somewhat more south than it did historically. And we would have New Ireland next to New England, how fun. What would this region be like, this additional Maritime Province?