USian vs United Statesian

USian

adj
  • Of or pertaining to the United States. 

noun
  • A citizen or resident of the United States. 

United Statesian

adj
  • Of or pertaining to the United States of America. 

noun
  • An inhabitant or citizen of the United States of America. 

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