"Canuck" a term once used by southern racists as an insult to dark skinned French Canadians, has completely lost any racial overtones in Canada, where it is used as a term of endearment. It has however found new meaning in the southern U.S.
"Canuck" has been replaced by "Canadian", as a racial slur. A Texas district attorney, Mike Trent, recently got into trouble for his use of the term in an email to a junior prosecutor. He used the term to refer to blacks on a jury.
"Canadian" is now being used to replace the racial epithets for black people.