Denying that American Civil war was about Slavery.
While certainly there other issues at stake they all came down to one fundamental point - the strong structural differences in the economy and society of the South vis-a-vis the North and this was fundamentally due to slavery (and the Cotton-Export dependant economy it created).
You have a point.
What I was mostly referring to was the way it was taught in like eighth grade history. A lot less focus on the economic part of the war and more on some sort of notion that the North was full of abolitionists and that the Union Army went down South because Slavery offended them so.
I was mainly pointing out that it wasn't the ideological idea of slavery that was the main issue. The economic issues of slavery, though, were THE issues of the Civil War.