Who did the spanish enslave to use to take gold and silver from the mines of mexico and peru?

The Asiento, the official contract for trading in slaves in the vast Spanish territories was a major engine of the Atlantic slave trade. When Spain first enslaved Native Americans on Hispaniola, and then replaced them with captive Africans, it established unfree labor as the basis for colonial mass-production.

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The Spanish enslaved The Asiento to take gold and silver from the mines

it should be d or b but i'm sure it's d