I attended high school in Michigan, Toronto and Knoxville. I learned about the civil war in all three schools. Michigan and Toronto schools focused on the slavery aspect and the inhumane practice that it was. In Knoxville, the teacher tried to minimize the atrocity that was slavery. I heard things like most slave owners were good to their slaves and the slaves themselves didn't mind the practice. Some masters even taught their slaves to read. We were taught the civil war was all about state's rights (ignoring the fact that the specific right at issue was the right to own folks).
None of the schools I went to ever taught about the contributions to the country made by slaves. We got to learn about two black people Harriet Tubman and George Washington Carver. A couple of paragraphs on each is what the lessons consisted of. No mention was made regarding the tremendous wealth generated by slaves.
All of this makes me not care about people, especially educators, taking a closer look at our history and giving it a more fair and balanced approach.