Please clearly identify by name and work the historians who support your view of slavery, the Confederacy, and the Klan. The two that I am aware of who would support your views to any degree are Southerners who wrote more than a century ago — and even they would reject most of your views by placing the race issue at the center of the reason for the Confederacy.
"Authorities" on a subject can be useful, but after having seen so many of them just utterly wrong, like Dr Fauci and Birx, it is foolish to put your faith in "authorities."
If something is true, it doesn't matter if an "authority" says it is not. People who can think for themselves can see the truth without resorting to an "Authority."
Charles Beard for one. He was considered the leading historian in the first half of the 20th century. His view is that the war was mostly about money. he was from Indiana originally and was on the faculty at Columbia so he was hardly a Southerner.
For my part, I don't place much stock in the opinions of other historians. I prefer to look at the original sources and see what they said before the events and during the events in question. I can do the interpretation myself. I don't require an Academic to tell me what my opinions should be.