But, if you insist:
As the late legal historian, Judge A. Leon Higginbotham, Jr. observed, Merchants from Massachusetts, the most vigorous slave traders in the world, made enormous profits from the slave trade.
- Massachusetts Historical Society
IIRC, Rhode Island probably had the largest slave trading port, but Massachusetts probably traded more slaves. Six of one and half a dozen of the other.
Well, you haven't exactly limited yourself to those events that occurred prior to the American revolution, and those events that occurred after either.
Of course that would require a deeper, more thorough examination of the issues, and a chronological breakdown of those events that occurred in British America before the United States came into existence, and established its own form of government.
However, since you seem to prefer playing on Lew Rockwell's 'Lost Cause' slip -n- slide, try not to hurt yourself.