dago vs spearchucker

dago

noun
  • A person of Italian descent. 

  • A person of Italian, Spanish, Portuguese, Greek, or other Mediterranean descent. 

spearchucker

noun
  • A black (African or African-American) person. 

  • An agitator. 

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