Familiar with the names and distribution of nine agricultural belts in the United States, and analyze the positions of dairy belt, corn belt and wheat belt.

The level of agricultural modernization in the United States is very high, and modern science and technology are widely used. Capitalist farms are the main mode of operation of American agriculture. Animal husbandry plays an important role in agriculture. The total agricultural output value ranks first in the capitalist world. Wheat, soybeans, corn and cotton are exported in large quantities, making it the largest exporter of agricultural products in the world. The implementation of regional specialized production in agriculture and the formation of a series of farming belts and agricultural areas can give full play to regional advantages. Distribution of main crop belts (regions): ① dairy belt: distributed in the northeast of the United States and along the Great Lakes; ② Spring wheat belt: located in the central plain west of dairy belt, connected with wheat producing areas in southern Canada. (3) Corn and soybean belts: distributed in the north-central low plain south of spring wheat belt and dairy belt; ④ Winter wheat belt: high plains located in the southwest of corn belt; ⑤ Mixed agricultural belt: located in the east of winter wheat belt, producing tobacco, soybean, corn, etc. ⑥ Cotton belt: distributed in the area south of 35 north latitude; ⑦ Subtropical crop belt: The Gulf Coast is rich in rice and subtropical fruits; (8) Grazing and irrigated agricultural areas: in the western Rocky Mountains and plateau basins. In addition, the northern section of the Pacific coast is a wheat and forest animal husbandry area, and the southern section is a fruit, vegetable and irrigated agricultural area.

Development conditions: flat and open terrain, fertile soil, warm and cool climate, concentrated cities, large population, large demand for dairy products and good market conditions. )

Central Plains-wheat area (north spring wheat area, south winter wheat area), corn belt-commodity grain agriculture (development conditions:

1, flat and open terrain, fertile soil, abundant water resources and warm and humid climate; 2. The land is vast and sparsely populated; 3. The industry is highly developed, which is a solid foundation for realizing high mechanization of agricultural production; 4. The Mississippi River, the Great Lakes and the dense railway network have convenient transportation; 5. Highly developed science and technology is the guarantee of agricultural modernization. )