United States vs Yankee land

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. 

Yankee land

name

  • The United States. 

  • New England. 

  • The northern states region of the United States. 

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