Everyone keeps to certain accents and dialects, wherever their country. England spread the language not only to the US, but most of Canada, Australia, New Zealand, South Africa. And different countries further, have subdivided.
Without further ado, here is the difference: Canadians pronounce the word “about” like “aboot.”
So if a linguistic war breaks between America and Canada, or just talking to a Canadian friend, you’ll have a litmus test (metaphorically) by closely and mutually observing how they talk. LOL