That's really unfortunate. Strangely enough, we spent very little time on WW2 in my public school (also in the USA). I honestly don't remember if we went over Canada's contributions to the war in class.

... come to think of it, the largest stretch of education regarding WW2 in public school that I can remember was in high school, when our history teacher took a full half week for us to sit in the darkened classroom in total silence to watch the actual footage taken of the death camps after the Allies liberated them. He was normally a very jovial and engaged fellow, joked with the students, was pretty lenient on us, all that, but that one time he emphasized with deadly gravity that it was necessary that everyone be silent and pay attention for it.

... unironically grateful for that. That stayed with me, for certain. I hope it stayed with everyone else in that class too.