I think I will continue to read the words that the founders of the Confederacy actually wrote in the time os secession as opposed to what the Confederate Revisionists have to say about the issues of slavery in the 21st century.
And the fact is that the Declarations of Secession of those four states mention “Slavery” 82 times and mention States’ Rights ZERO Times!
Painting the CSA states as "united" and all Southerners subscribing to the tenants of the Articles of Secession is not a platform to build your argument from - there are so many more sources, correspondence, records, etc should you choose to investigate. Good luck.