I was not aware the U.S. imported cotton in those days, Joey. We had cotton running out our ears; and our cotton exports dominated the world. The U.S. Historical Statistics for 1790-1957 doesn't even list raw cotton as an import. Open this link and scroll down to p.548:
Maybe I am missing something, or perhaps you are confusing raw cotton with cotton textiles. There were tariffs on textile imports to protect the New England textile manufacturers from European manufacturers.
I am not saying you are wrong, but I would like to see a reliable source for your data. The Civil War Talk forum you linked is loaded with misinformation and poor sourcing.
Mr. Kalamata
I addressed this with him before. Cotton needed absolutely no protectionist tariff on it, because no one could produce it cheaper than the American South.
Putting a tariff on cotton imports may have been a misguided method of pretending to be looking out for the South's interests, but tariffs on cotton or "woolens" or brown sugar had no benefit to the South because they didn't need any of that stuff.