Answer:
Slavery was so profitable, it sprouted more millionaires per capita in the Mississippi River valley than anywhere in the nation. With cash crops of tobacco, cotton and sugar cane, America's southern states became the economic engine of the burgeoning nation.
Step-by-step explanation:
England's southern colonies in North America developed a farm economy that could not survive without slave labor. Many slaves lived on large farms called plantations. These plantations produced important crops traded by the colony, crops such as cotton and tobacco.