Most Canadians live close the the border. If you cross to the American side of border, in a rural area, do Canadianisms (1) like "aboat" (2) suddenly become much less common?
Since this created controversy, allow me to quote the dictionaries:
(1)
Canadianism
noun
- a word, expression, or other language feature that is characteristically Canadian.
- the state of being Canadian, or the character and spirit characteristic of Canadians.
(2)
- https://en.wiktionary.org/wiki/aboat "This spelling has been used to represent Canadian raising"
- https://en.wikipedia.org/wiki/Aboot
- https://en.wikipedia.org/wiki/Aboat
P(X | speaker is Canadian) > P(X)
(conditional and marginal probabilities, respectively), then it's a Canadianism.