I was taught in my (large all white) Lutheran Bible school that the Civil War was not about slavery. I was taught that it was about States Rights.
Histories now say that most historians say it is all about slavery. But they say the public doesn't all agree.
They talked all about it on PBS News last night.
(it's the anniversary of it)
"And the kind of research that historians have undertaken, especially in the years since the centennial, when there has been so much interest in this question of the role of race and slavery in the United States, that research has shown pretty decisively that, when the various states announced their plans for secession, they uniformly said that the main motivating factor was to defend slavery."