Ah the old 'prove that something that didn't happen didn't happen' arguement. The fact that virtually none of the documents or speeches or writings of the southern leaders in 1861 mention tariffs as a reason for the rebellion seems to be pretty strong evidence. To everyone but you, of course. I must be a pretty special person! Thank You!
Now if for instance, that if I couldn't admit the Hitler declared war on the United States in 1941, I am sure you would pounce on me for that, right? Or are you selective in your bias?