Final answer:
The food exports from US farmers increased during WWI due to the demand for food supplies to support the war efforts. Grain from the Great Plains of the United States fed British and French troops, resulting in a boost in exports and agricultural prosperity in the Midwest.
Step-by-step explanation:
The food exports from US farmers increased during WWI due to the demand for food supplies to support the war efforts. With the European armies needing calories, the United States stepped in to fill the gap by supplying grain from the Great Plains. This led to a significant increase in exports and brought wealth to Midwestern agricultural communities.