The U.S ranks first in the production and export of corn. It produces nearly 50% of the corn in the world.The Corn Belt is in the Midwest. Iowa is the leading corn-producing state. The Midwest is the most important agricultural region of the U.S.

• 美国的玉米产量几乎占到世界总产量的50%25，是世界最大的玉米生产和出口国，玉米带主要位于中西藏部地区，衣阿华是主要的玉米生产洲，中西部是美国最重要的农业区。