Native American vs metis

Native American

adj
  • Of the American Indians. 

noun
  • A member of some Indigenous peoples of the Americas. 

  • An Indigenous person of the Continental United States (excluding Hawaii and the other Pacific territories, since those aren't a part of the Americas). 

metis

adj
  • Of mixed heritage 

  • Of Métis heritage. 

noun
  • A person of mixed-race ancestry. 

  • A person of one-eighth black ancestry; an octoroon. 

  • Practical intelligence; street smarts. 

How often have the words Native American and metis occurred in a corpus of books? (source: Google Ngram Viewer )