If you want to know the causes of the civil war, you just have to read the various articles of secession. They are quite open about their motives.
You can find them on the internet with just a few clicks.
I disagree. You can just read the Corwin Amendment and Lincoln’s endorsement of it in his first inaugural address to see what was not the issue.
That simply obfuscates the real issue. Only 4 states out of 11 made such statements in their articles of secession, and Paul Craig Roberts asserts they did it out of legal necessity.
Most states did not make such statements, and Virginia explicitly said that they were seceding because the Federal government had become tyrannical and oppressive in calling for war against states that wanted to leave.
You can find them on the internet with just a few clicks.
Yes, all the propaganda promoted by the corrupt powers that won the war are quite easy to find.
Finding the economic data that shows how much money the connected powerful "elite" in the North would lose if the South gained it's independence is quite hard to find, but in the economic records you will see the actual truth, because the numbers don't lie.