The South had a right to secede. It says so right in the Declaration of Independence which is the document that legitimized our own secession from England.
Your sense of history and the union is skewed
My sense of history is accurate. It took me years to unlearn a bunch of propaganda that I had been taught all my life. Now I see things more clearly than most.
The South had just as much right to become independent as did the 13 colonies.
Re: first paragraph
You can make that argument all you want. A war fought over a century and a half ago says otherwise