Read the following paragraph from the section "Seeking New Sources Of Labor." With ideal climate and available land, property owners in the southern colonies began establishing plantation farms for cash crops like rice, tobacco and sugar cane. These enterprises required increasing amounts of labor. To meet the demand, wealthy planters turned to slave traders, who imported even more kidnapped Africans to the colonies, the majority from West Africa. More Africans were imported and had children, thereby increasing this human "inventory." A new industry was born: the slave auction, where humans were inspected like animals and sold to the highest bidder. What is the MAIN reason the author includes this paragraph in the article?