Answer:
Slaves were available free of cost.
Step-by-step explanation:
The Africans formed the main labor force in the southern colonies. The main reason behind this was that they were available free of cost. The economy of South was based on agriculture and particularly on the plantation of cash crops such as sugarcane, tobacco and sugar. The cultivation of such crops required an intensive workforce. Therefore, the Southerners supported the slave trade and employed slaves on their plantation.