Usonia vs the fruited plain

Usonia

name
  • Frank Lloyd Wright's utopian vision of the United States 

  • The United States of America; a one-word name for the country that does not have the ambiguity of "America". 

  • A community in New York state designed by Frank Lloyd Wright in his Usonian style 

  • In geopolitical and international economic modeling, a prototype superpower that, in competing with an antagonistic superpower Russonia (the Soviet Union), allows Thirdonia (a hypothetical neutral Third World country) to extract considerable wealth from both. 

the fruited plain

How often have the words Usonia and the fruited plain occurred in a corpus of books? (source: Google Ngram Viewer )