‘But what other reason than slavery did the south cecede for?’
Virginia left the Union primarily because ‘she’ knew the war would be fought there, in large part. It was questionable if Virginia would vote to follow the first five states right up til the moment Lincoln called for an army of 75,000 troops to ‘quash the rebellion’. The only way that army could have done so was by marching through Virginia.
Just one example that comes to mind.
As you might know, there was always a very real tension between the States Rights crowd, and the Strong Central Government types. It began festering about ten minutes after Cornwallis surrendered in the Revolutionary War, from what you read of the era. And its still going on today, as we see ‘unfunded mandates’ from DC forced upon various states, for varying reasons.
And the other ten confederate states? What rights other than the threat of abolition were violated? Specific examples please.