Answer: A. tobacco farming was hard on the soil
Step-by-step explanation:
For a while before the American Civil War, tobacco farming in Virginia had began to slow down so the people turned to other forms of economic activity such as the domestic slave trade.
After the Civil war ended n victory for the Union, they could no longer do so and so looked for other areas to farm because of the difficulty involved in tobacco farming. They therefore migrated to other parts of the country.