The agricultural policy of the United States is composed primarily of the periodically renewed federal U.S. farm bills. The Farm Bills have a rich history which initially sought to provide income and price support to US farmers and prevent them from adverse global as well as local supply and demand shocks. This implied an elaborate subsidy program which supports domestic production by either direct payments or through price support measures. The former incentivizes farmers to grow certain crops which are eligible for such payments through environmentally conscientious practices of farming. The latter protects farmers from vagaries of price fluctuations by ensuring a minimum price and fulfilling their shortfalls in revenue upon a fall in price. Lately, there are other measures through which the government encourages crop insurance and pays part of the premium for such insurance against various unanticipated outcomes in agriculture.
According to the United States Department of Agriculture[1]
"U.S. agricultural policy—often simply called farm policy—generally follows a 5-year legislative cycle that produces a wide-ranging “Farm Bill.” Farm Bills, or Farm Acts, govern programs related to farming, food and nutrition, and rural communities, as well as aspects of bioenergy and forestry. The most recent of these Farm Bills, the Agricultural Improvement Act of 2018 (2018 Farm Bill), authorizes policies in the areas of commodity programs and crop insurance, conservation on agricultural lands, agricultural trade (including foreign food assistance), nutrition (primarily domestic food assistance), farm credit, rural economic development, agricultural research, State and private forestry, bioenergy, and horticulture and organic agriculture. The 2018 Farm Bill replaces the 2014 Farm Bill, in place from 2014 through 2018."