You need to read some history, my friend.
The vast majority of trade was between the Southern states and Europe; the North exported nothing, and imported very little. The South, on the other hand, exported almost its goods and products, and imported a great deal of what it needed and wanted in return. Eli Whitney’s little invention was a marvel, no?
Then why were almost all of those goods landed in three Northern ports? If they were destined for Southern consumers why didn't they go straight to Southern ports?
The South, on the other hand, exported almost its goods and products, and imported a great deal of what it needed and wanted in return.
A grear deal? In one sentence you say that they imported almost everything and then suddenly it's a great deal. There is a paradox in what you claim, if the North imported next to nothing then why, based on revenue collections, did all the goods land there? What sense is there to bringing goods destined for South Carolina to New York, land them, pay tariffs, load them again, and send them South?