I believe its abolishing slavery!
One reason: Plowing large areas of land
A few more reasons: poor farming practices, farmers would loosen up the soil, and the land was deforested, making it loose the roots that held the soil in place.
Answer: Slavery in the Western Territories. To many nineteenth century Americans, the expansion of slavery into Western territories caused a great deal of controversy. ... The federal government, hoping to prevent a civil war, temporarily resolved the issue with compromises.
Explanation:
I believe the answer is b because a is out of the question because it talks about artwork