How can it be called a "civil war", if it was a war between two nations? It was not USA vs USA, it was CSA vs USA.
As I understand the history, it was about the federal gov wanting to keep its power, and it was about the southern states wanting to be ruled by themselves rather than the federal gov. It was not directly about slavery, though, it was slavery that led to southern states seceding. While it is good that slavery ended, it is bad that the USA became more centralized in governance as it transitioned to a central monolithic federalist system. The USA of today is not the decentralized system the founding fathers envisioned. Also, slavery did not actually end, it just took a different form.
Taxation is slavery. Fiat is slavery.
