So what was the states rights deal breaker the led to the Civil War? And what was the single item that separated north from south? And what Peculiar Institution, what over-riding mindset, kept the south from developing its own industry?
If you said slavery you win a big kewpie doll. LIncoln had been a Free Soil Whig before the Whigs imploded over slavery and the Republican Party came together in the 1850's. The south's conviction that Lincoln would carry through on his beliefs caused the south to secede. No more babble about slavery being a fig leaf for Lincoln.