Your comment seems almost unrelated to the topic, so could you explain your point further?
300 years ago, Boston and Newport were important slave ports, and "In Rhode Island colony, as much as two-thirds of the merchant fleet and a similar fraction of sailors were engaged in slave traffic." - http://slavenorth.com/profits.htm
"Slavery was very substantial in early Manhattan. Very early on, the populations of enslaved people began to grow. By 1740, enslaved people were one-fifth of the population of the early city, and enslaved black men were one-third of the work force." - from an interview with Anne Farrow, co-author of the book "Complicity: How the North Promoted, Prolonged, and Profited from Slavery" at https://www.npr.org/templates/story/story.php?storyId=504237... .
Northerners profited from supplying the Caribbean sugar plantations, all run on slave labor.
Even after slavery was abolished in the North, the US economy was integrated. Northern textile mills processed Southern cotton. Northern shipwrights made ships to carry Southern cotton. Southern cotton picked by slaves.
I don't think you can deny that slavery was an important part of the success of the American colonies during the time ("a few hundred years ago") that solotronics mentioned.