You have no idea what you are talking about. The War of Northern Aggression was started because the South was tired of supporting the Federal Government who was getting 90 per cent of it’s budget from federal excise taxes on southern exports. Slavery was only brought up after the conscription riots in the north so to give them the moral high ground. Why did it take so long to announce the emancipation proclamation. And why were only the slaves in the south freed?
I don't think so.
"No Tax or Duty shall be laid on Articles exported from any State." - United States Constitution Article I, Section 9, Clause 5