America vs United States

America

name

  • The United States of America. 

  • A town in Limburg, Netherlands. 

  • The Americas. 

  • A female given name. 

United States

name

  • The collection of individual states of the United States of America. 

  • Federal nation consisting of several states, actual, historical or hypothetical. 

  • Includes the land area, internal waters, territorial sea, and airspace of the United States. 

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