The Great Plains, sometimes simply "the Plains", is a broad expanse of flatland in North America. It is located west of the Mississippi River and east of the Rocky Mountains, much of it covered in prairie, steppe, and grassland. It is the southern and main part of the Interior Plains, which also include the tallgrass prairie between the Great Lakes and Appalachian Plateau, and the Taiga Plains and Boreal Plains ecozones in Northern Canada.
In general, the Great Plains have a wide range of weather, with very cold and harsh winters and very hot and humid summers. Wind speeds are often very high, especially in winter. Many thunderstorms occur in the plains in the spring through summer. The southeastern portion of the Great Plains is the most tornado-active area in the world and is sometimes referred to as Tornado Alley.
Agricultural activities range in the Great Plains from crop production, dominated by alfalfa, barley, corn, hay, soybeans, and wheat to livestock production centered on beef cattle along with some dairy cows, hogs, and sheep. The Great Plains also contributes substantially to wind power in the United States.
According to the Wikipedia