I can recall the 1941 film called The 49th Parallel. It somehow gave the impression that the dividing line between the two countries was this parallel. General impressions way back can give rise to mistakes as I have found out to my embarrassment.
Anyway a huge propaganda film. Created by Pressburger and Powell to bring US opinion to support Britain WW2. Seven bad Nazi U-Boat crew and one "good, anti-Nazi German". Hiking across Canada. Of course the attack on Pearl Harbor did bring the USA into the war, not British propaganda.