States vs U.S.A.

States

name
  • Those parts of the United States comprising states rather than territories. 

  • The parliament of either of the two Channel Islands countries: the States of Guernsey or the States of Jersey. 

U.S.A.

name
  • Dated spelling of USA. 

How often have the words States and U.S.A. occurred in a corpus of books? (source: Google Ngram Viewer )