New Englanders, being good Calvinists, had (had?) a tradition of externalizing their morality, some would say of being busybodies. The culture in New England could not stand the contradiction of being a democracy ostensibly founded on the principles of equality and legalized slavery. The culture also mitigated against wholesale importation of slaves.
I don't know that there is any evidence that slave trade was ever more than an incidental part (if that) of the economy of New England.
"The culture in New England could not stand the contradiction of being a democracy ostensibly founded on the principles of equality and legalized slavery. The culture also mitigated against wholesale importation of slaves."
Uhmmm, no. The first slave port in the American colonies was established in Massachusetts, in 1638.
Also, as noted in my previous reply, Massachusetts started in 1638, followed by Rhode Island, where the chief slave port in the American colonies was located, rivaling Liverpool in England. Slave trading and the export of rum became the basis of New England's economy. The Southern colonies were not a part of the trade, having neither ships nor molasses. In 1774, the importation of slaves was forbidden by the people of North and South Carolina.
How's that for "who knew?" LOL.