middle america

noun

1. average middle-class Americans as a group, as distinguished from the rich or poor or the politically extreme.
2. the Midwest.
3. continental North America S of the U.S., comprising Mexico, Central America, and usually the West Indies. 1,060,118 sq. mi. (2,745,705 sq. km).

noun

1. the territories between the US and South America: Mexico, Central America, Panama, and the Greater and Lesser Antilles
2. the US middle class, esp those groups that are politically conservative

The interior regions of the United States, as distinguished from the East Coast and West Coast.