all polling has shown that Clinton would've won in a landslide in every province.
The better question is how the Canadian provinces had voted if they actually we're American, had a common history, culture etc with the USA.
Yeah. In that case, I'm pretty sure that AB, SK and MB at least would be solid Atlas-blue. BC and ON would probably be reliably Democratic. The Maritimes might have politics similar to Maine (I could even see Republicans winning NB in the right context). Québec is a complete mystery.
No way the Republicans could win New Brunswick. The Republicans would do about as well with actual, speak-French-at-home Francophones as they do with blacks. Anglo New Brunswick would be the most Republican part of the Maritimes, but it wouldn't be enough for the Republicans to win New Brunswick overall. Newfoundland might have voted for Trump, though, despite a generally solid Democratic tradition (definitely Obama in 2008 and 2012 and also Kerry, Gore, etc.), and it's possible PEI would generally be a Republican-leaning province but hard to predict. Nova Scotia would be solidly Democratic, with a history similar to Rhode Island.
Quebec and Ontario are solidly Democratic. Manitoba also is Democratic; Winnipeg outvotes the southern hinterland, and the northern hinterland is solidly Democratic. Saskatchewan is historically Democratic but Republican-leaning now, though better for the Democrats than the Dakotas (might have voted for Obama in 2008 but not in 2012, solid Trump in 2016). Alberta is solidly Republican. British Columbia is polarized but solidly Democratic (like Washington and Oregon).
Yukon probably votes about like Alaska, so overall Republican but also quite swingy. Northwest Territories and Nunavut are solidly Democratic.