Secession is the technical reason for the war, as it was the technical detail that was needed for Lincoln to legally start killing southerners.
But that technical detail conceals the truth, as do the republicans.
Slavery Rights was the paramount to the war.
It was at the very heart of the matter, from the very beginning and right up through the emancipation.
It's almost laughable if not for the sad truth- 150 years later and republicans are still teaching their young that the civil war wasn't even about slavery.
And people wonder why our country is so fucked up?
It's a shameful disgrace.