Taken from the Confederate Flag thread in Politics... All of the "deep south" states seceded immediatly following Lincoln's election. The four "border states" that did not secede did not secede precisely because there was no clear preference for slavery in those states. Delaware had few slaves, so never considered secession, and the other 3 states have major internal conflicts over the issue. http://en.wikipedia.org/wiki/American_Civil_War I disagree, but eh - this is an issue that has been debated for 150 years and will likely be debated for another 150 years. That is, of course, true, but that doesn't have anything to do with the fact that the slave states seceded immediately following Lincoln's election and South Carolina's Ordinance of Secession specifically mentions slavery as the "states rights" issue at issue. The main difference between large and small, agricultural and mercantile was slavery. While I know slavery wasn't specifically at issue in the Great Compromise (it was a basic power struggle), slavery was one of the prime characteristics that differentiated the states. There were two other compromises (3/5 compromise and the putting off on slave import regulations until 1808) that took a fair bit of negotiation to solve.