Because Africans had expertise in the area of Agriculture.
Explanation:
Europeans in the New world came for colonization and to acquire the good of the lands in different regions. To dominate the New World, Europeans enslaved Africans, Caribbeans, Latin America among all other regions they dominated. They required a number of slaves to work on farms and plantations. As a result of the low supply and increase in the price of white slaves at that time, due to the outbreak of diseases, Europeans, both the England colonies and American colonies resorted to African slaves because they were affordable.
Africans were exceptional. They had expertise in agriculture and knew how to plant and uniquely grow crops. African slaves were immune to diseases. African slaves as laborers were efficient. The Europeans were impressed with how much crops they harvested and they soon expanded the plantations.
