[ska]

But it's not simply North/South, it is very specifically almost Toronto and surroundings, vs everywhere else.

For example, in BC the population centers are on the southern border (thanks to a) the Fraser river, and b) politics). But in Alberta they really are not. Nor Saskatchewan. Manitoba sort of is, by geography. So if you were to do this analysis on western Canada, it wouldn't be nearly as clear cut.

Most of "the south" of Canada doesn't have much similarity with south western Ontario, for that matter.