The term 'State of the Corn Belt' refers to Iowa, which is a state located in the Midwestern United States. It is known for its agricultural production, particularly corn, and is often referred to as the 'Corn Belt'. Iowa is the leading producer of corn in the United States, and it is also a major producer of soybeans, hogs, eggs, and dairy products. The state is home to many large farms and agricultural businesses, making it an important part of the nation's agricultural economy.