Answer:
By the time of the Civil War, about 200,000 worked in industrial-type occupations.
Explanation:
It is true that industrial revolution came pretty late on southern states compared to the northern states.
But, there were still some business owners who adopted knowledge from the north to the economic production on the southern states. Because of this, by the time of the civil war, about 200,000 slaves were used by those business men to support industrial-related jobs.