How were slaves essential to all 3 sides of the trade?

Mercantilism led to the emergence of what’s been called the “triangular trade”: a system of exchange in which Europe supplied Africa and the Americas with finished goods, the Americas supplied Europe and Africa with raw materials, and Africa supplied the Americas with enslaved laborers.

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workers of lowell mills were greatly benefited for the waltham type of work which was more a paternalist kind, trying to protect the integrity of this little girls coming from small farmers and providing an adequate place of work, this in an effort to avoid the issues of bad place conditions and immorality that the people in bigger industrialized cities of great britain were experimenting.

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