Which change took place in the africa slave trade in thee 1500s ?

Enslaved people were sent to the Americas by Spanish and Portuguese as labors

Explanation:

Slavery has been a concept that lived with humanity for a long time, but the Portuguese and Spanish changed it deeply. Before them, slavery was connected with those who lost a war or had debts or were born is a low social class.

With the Spanish and the Portuguese, they started to explore the Continent of Africa and use Africans as slaves in the Americas. This started around the 1500s and lasted a few centuries. With this exploration, slavery became directly linked to race and color of the skin, something that did not happen before the exploration of the African countries.