United States vs land of opportunity

United States

name

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

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

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

land of opportunity

noun

  • The United States. 

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