I have answered a similar question before here. And there is also a section in the FAQ about Canada's involvement in the American Revolution that might shed some more light.

The TL;DR version is that, yes, they were viewed as separate because Quebec was populated by French-speaking Catholics, and the two English-speaking colonies established at the time the war broke out--Prince Edward Island and Nova Scotia--were mainly populated by ex-pats from the Thirteen Colonies who had only settled there after the end of the French and Indian War in 1763. In other words, the English-speaking population of Canada was being founded simultaneously with the political events that led to the American Revolution, so the types of British Americans willing to relocate to Canada were also the types of British Americans who were likely to take the Loyalist view during the Revolution. Not all of them did, but most of them did.

Further info can be found in the links above.

Thanks. That’s a very good summary that you’ve linked to!