Yes because Slavery in general was dying out.
We're here to help you, buddy, get you on board with actual Southern states history. By the time of the Civil War slavery was
not yet dying out. It was reaching its peak at that time. The Southern slave states knew that if they were stopped from
expanding slavery into the territories that slavery
would die out, and that's what they would fight for.
(did you think it was Yankee invasion? pfft).
...Slavery was in the north and was deep into the slave trade for quite some time...
But no longer. Slavery remained legal only in the middle and lower South, no free Northern states whatsoever for quite some time. The Northern states, including the original colonies, had all criminalized slavery
decades before secession. Not only that, but the extent of slavery in the Northern states was never comparable to the massive extent of chattel slavery in the middle and lower South. From the very first census taken (1790) it's obvious there was only a small mioirty of black residents in the North to begin with, let alone slaves ("servants" in the census lingo of some states).
...The south was simply slower in development but now here it is with industry everywhere so the need for slavery is gone.
Again, get on board with Southern states history. The South, because of chattel slavery, had the most successfully profitable export business in the Country (maybe the world) at that time. The middle and lower South was not
"simply slower" in industrial development, they were
"simply more engaged" in the more profitable enterprise at the time. The Southern oligarchy was not about to give up "King Cotton" to build factories and
pay their workers.
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The biggest enemy of "Lost Cause;" the thing that has reduced it to the the point of "Lost Cause Lite" anymore (LCL an attempt to distract from what original Lost Causers had believed) is
educational resource -- free and easy democratic access to the official records and un-edited accounts of those who lived in the Antebellum and Civil War years. No grey-tinted glasses. Few corners in which to hide anymore.