between 20-25% of each years cotton crop went to the textile manufactures in the U.S. mostly in the Northern States. The balance was shipped to Europe.
Where it produced 73-85% of the total US export value to Europe, and which were exchanged for European goods taxed at a very high rate if they were likely destined for Southern consumers.
Almost all the money and trade routed through New York, with Washington getting it's huge greedy cut of the slave produced money.