Sometime when you're bored, read the Confederate Constitution. To my surprise, it's very very similar to the US Constitution. Being written later, the Bill of Rights (e.g. the one about bearing arms) are regular articles instead of amendments - but worded very similarly. Various little differences, of course - housekeeping in a lot of cases. What is markedly not similar? Lots and lots of details about slavery. If you're going to secede, it wouldn't make sense to not make any changes. Well, locking in slavery was the main thing they changed. The US constitution kind of danced around slaver and never called it by that name - the Confederate version uses straightforward language to define and preserve it. It blows away all the lofty gaslighting afterward about "preserving our cherished way of life" or "states rights". The disagreement was, as it always was, about slavery.