Yeah, like cutting the 75% of the taxes their 25% of the citizens were paying, while the Northern 75% of the citizens were only paying the remaining 25%.
Also cutting out the onerous legal requirements for shipping that guaranteed that the traffic would be handled by North Eastern shipping companies.
No Southern or Northern citizen paid one red cent in taxes to the Federal Government. Say tariffs if that is what you mean but do not hide it as taxes, they were not. Southerners were perfectly free to ship all of the cotton they wanted to Europe and use British or French, or Chinese merchant ships to carry that cargo to Europe. The law required cargo being shipped from a United States port to another United States port had to be carried by a United States flagged ship. That trade accounted for about 15% of the Southern Cotton crop which was sold to Northern cloth manufacturers. If there was a Southern owned ship that they wanted to hire to transport that cotton, they were free to do so.
And you can cite a source for that, or just your own vivid imagination?