(1) Moderate rainfall in winter Explanation: The Great Plains region of the US is called "the Breadbasket of the US" because of its huge production of grain, particularly wheat, which is used in making bread. This region is called the Corn Belt, or (occasionally) the "Grain Belt", the most intensively agricultural region of the Midwest. These are the areas of moderate rainfall as rainfall decreases from east to west, resulting in different types of prairies.