I got my proof of it being about slavery is right out of the CSA Constitution:
Slavery is addressed 10 times in their "Constitution"
1 example = "No bill of attainder, ex post facto law, or law denying or impairing the right of property in negro slaves shall be passed."
@Gladari Hell, the leaders of secession said it was about slavery.
The Declaration of Causes of Seceding States. If you can't get that it was about Slavery from THIS, then you just don't want to, right?
https://www.battlefields.org/learn/primary-sources/declaration-causes-seceding-states
This is a Primary Source, First-hand and Direct from the Confederate States.
@LiberalLibrarian
And that children, is why we should teach history.