Wilmot Proviso This section needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed. .
. . This struggle took place amid strong support for slavery among white Southerners who profited greatly from the system of enslaved labor But slavery was entwined with the national economy; for instance the banking shipping and manufacturing industries of New York City all had strong economic interests in slavery as did similar industries in other major port cities in the North the northern textile mills in New York and New England processed Southern cotton and manufactured clothes to outfit slaves by 1822 half of New York City's exports were related to cotton! .
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