The answer should be industrialized nations.
Thank you to USA.
Answer: Farming
Explanation:
The Great Plain is a large area of flat land in North America. Due to it being a huge vast of land, it typically supports farming and cattle ranching and this contributed to erosion that is, when the top surface of the land is being washed off.
Therefore, the option that directly contributed to soil erosion on the Great Plains in the 1930s is farming.
