This so tiring. The South promised Virginia higher tariffs if they would secede, so how could that be a bone of contention? There was no impediment to their foreign trade while they were part of the Union. There simply is no 'myriad of other things' that drove them to rebel. The simple inescapable fact of the Southern rebellion is that you can take away every single reason for the rebellion except slavery and the South still rebels. Take away slavery and leave every other reason you care to name and the South doesn't. The war aim of the South was to break free of the Union. The reason for that war was to defend slavery.I tire of incessant drumbeat on slavery as the only cause of the war because it was not the only cause. The South wanted to secede to protect slavery, yes, but independence offered them far more than simply that. It offered reduced tariffs, increased foreign trade in King Cotton and a myriad of other things the South wanted. The war aim of the South was clearly to create an independent Southern Republic in which slavery was protected, but an independent Republic.