half-breed vs of color

half-breed

adj
  • Having dual heritage; having mixed racial parentage or ancestry. 

  • Hybridized; having one purebred parent; descended from parents of different breeds or with different traits. 

noun
  • A person of mixed racial parentage or ancestry, especially one of mixed white and American Indian parentage (metis, métis, Metis, Métis; mestizo). 

  • A hybrid animal or plant. 

of color

adj
  • Belonging to a category of people with mixed black and white ancestry in the Americas in the 18th and early 19th centuries. 

  • Nonwhite; of a race other than white, for example black. 

How often have the words half-breed and of color occurred in a corpus of books? (source: Google Ngram Viewer )