One of the main reasons it's overshadowed is because slavery was overshadowed by the US. The US had more slaves, more brutal slavery, a war over whether to keep slavery, and have very well documented suppression of education relating to slavery and racial injustice in the US. Canada pretty much managed to fly under the radar, and slavery was banned earlier. On top of that, slavery had pretty much died out in Canada by the time it was banned. Slavery was also going on while Canada was controlled by other european powers. It was ended relatively peacefully as well.