How did changes in farming on the Great Plains during the late 1800s and early 1900s signify an agricultural revolution?
a. Immigrant farmers introduced European-style farming that led to huge cooperative farms.
b. Farmers abandoned traditional crops and turned to new food crops to sell to immigrants.
c. Farming was transformed from self-sufficient family operations to big business.
d. Farming gave way to other kinds of agriculture such as ranching.