Um, yeah, New England is a region, just like the South you referred to is, check your elementary school geography...
My point is that states North and South had to answer for the slave trade, not simply those of a particular region.
Did the “South” own slaves or purchase them from New England shipping companies? Or was that a (rather small) minority of individuals in the South?
You are aware that FAR more slaves were taken to Caribbean plantations, and to points in Latin America, than ever made it to the southern USA, right?
Also, you never responded to the fact you posted plans of a British slave ship, and, that the slave trade to anywhere in the USA was long over before the Civil War ever began.
One, I didn't post those plans, and two, even though illegal under US law since 1807, slave imports continued in the Deep South up to and even during the Civil War.
One by one, Northern states legally abolished slavery -- peacefully and often with a long "phase out."
No Southern state did so, nor seriously considered doing it on their own.
But while slavery was legal in many states, the international slave trade was not, and the Federal Government did take actions to enforce the law against slave ships on the high seas.
And the real issue in 1860 was not slave ships owned by some northerners, but rather the refusal of many Northern states to enforce Federal Fugitive Slave Laws.
This was a major complaint listed in the Confederate Causes of Secession documents.