As a first generation American born of French Canadian parents and having lived in Canada, I always understood the term "Canuck" as a reference to French Canadians. The term was sometimes used derogatorily as it was when my ex sometimes called me a "Canuck" which I was not too fond of. I know that now it refers to a broader group of Canadians and am glad it has a prouder definition. In a related term "Cajun", comes from a deformation of "Arcadian" which refers to the people in the maritime provinces of Eastern Canada who were kicked out of Canada and came down to settle in Louisiana. The word "Arcadian" or "Arcadien" pronounced in French with the soft "D" after a while became "Cajun". How about that? And, not that it will make a difference to anyone, but I am now a Southernized Yankee.