Mesoamerica vs Middle America

Mesoamerica

name
  • A pre-Columbian cultural region extending from the southern part of Mexico to an area that comprises some parts of the countries of Central America 

Middle America

name
  • A geographical region comprising Mexico, Central America and the Caribbean 

  • A portion of the United States comprising rural and suburban areas, and the mindsets of these areas. 

  • The Midwestern United States. 

  • The American middle class. 

How often have the words Mesoamerica and Middle America occurred in a corpus of books? (source: Google Ngram Viewer )