I like it to call it the War Between the States, and not the Civil War. If you look up Civil War in a dictionary, then you will find out that it’s a struggle for control over a government. The South did not want anything to do with that government, and separated to form their own government.
I always wondered how Constitutional the War Between the States was? I did not think their is a clause that says you cannot leave unless 2/3rds of the states agree. Never heard that before.