That's only a stereotype. Trust me, Canadians can be just as salty as every other person on the planet.

How do I know? I live among them.
Also, allow me to flip through my history records of the accomplishments of Canadians during times of war... Alright, let me see... Alright... Okay then... Mmm-hmm... Nope, sorry, I can't find anything. Even today, any other super power (Russia, U.S.A., even England) would crush us without a sweat.
Also, Canada barely participated in WW2, at least to my knowledge.