How did slave labor help sustain the economic system in the southern colonies please help

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.

Explanation:

The plantation system developed in the American South as the British colonists arrived in Virginia and divided the land into large areas suitable for farming. Because the economy of the South depended on the cultivation of crops, the need for agricultural labor led to the establishment of slavery.

Explanation:

c) they were beaten and fired from their jobs.

your answer will be b. improving roads, bridges, and other infrastructure. hope i !