I can answer that. During the American revolution, all the people loyal to Britain were kicked out of their homes, ridiculed, sometimes tarred and feathered, some had their homes burned, and most had their possessions siezed. This kinda led to a resentment of america and what it stood for, and since most of these people settled in Canada after being kicked out of the US, it kinda stuck. And until the collapse of the British Empire, it was our biggest and closest friend and ally, so we took after them rather than the US.