Answer:
The correct answer is A) Manufacturing
Step-by-step explanation:
At the time of the Civil War, the United States was divided into the poorer Southern States and the more affluent North-Western States.
The original thirteen States which gained Independence from Great Britain had a clear head start and quickly became industrialized countries.
Most people made money from working in the large manufacturing units.
However, the South was sparssly population and consisted of large land holdings.