[DiogenesLamp]

the Navigation act of 1817 was passed in retaliation for the British closing their Caribbean ports to American ships. Not as a measure to stick it to the South.

Which is why it initially passed with support from the Southern states. It wasn't till later that they discovered how it was to be used to rack up profits and control for the same North Eastern headquartered businesses.

Nothing in the Navigation act requires the use of New York or Northeastern shipping companies.

You should read how William Willberforce cleverly tricked the Slave side into accepting proposed legislation that had no obvious threat in it when it was passed.

They didn't see the threat in it, and in so many years, that legislation utterly destroyed the slave trade.

[Bull Snipe]

Which United States law required ships from Europe to unload their cargos in New York or other Northern ports. Still waiting for the answer.

[BroJoeK]

DiogenesLamp: "They didn't see the threat in it, and in so many years, that legislation utterly destroyed the slave trade."

I suspect that sentence is a typographical error, or, just as likely, Freudian slip.

Perhaps you'd like to correct it?