[DiogenesLamp]

The southern slave owners thought differently.

And we know this because countless northern history writers keep telling us this, even though it doesn't make any real sense when you look at the facts.

[DoodleDawg]

And we know this because countless northern history writers keep telling us this, even though it doesn't make any real sense when you look at the facts.

We know this because countless Southern leaders told us.

[BroJoeK]

FLT-bird: "Anybody who has read Lincoln’s Inaugural Address or who has read the Corwin Amendment knows slavery was not threatened in the US."

rockrr:"The southern slave owners thought differently."

DiogenesLamp: "And we know this because countless northern history writers keep telling us this, even though it doesn't make any real sense when you look at the facts."

It's complete nonsense to claim the Deep South seceded for any major reason other than protecting slavery.
Slavery is what they said at the time and any other reasons listed are clearly secondary, clearly just "politics as usual", nothing powerful enough to motivate millions of otherwise loyal Americans to declare secession.
Only slavery could do that, and so that is what Fire Eater leaders emphasized, regardless of what else might be their hidden "real reasons".