The real, underlying issue was states rights vs federal government. It was unresolved from the constitution, not in slavery itself, but in how much the fed govt could regilate states. The same controversy exists today in Roe v Wade. The South, simply put, didnt think the Federal Govt had the right to decide if slavery was legal or not. This led to the controversy of nullification, whereby states could choose to ignore laws that they viewed as unconstitutional. They took it a step further and secceeded. To say it was about slavery is a gross over simplification, but it's what is generall taught in school . . . of course the very nature of this thread is aruguably the failures of schools to educate.