Google Books Ngram Viewer

Graph these comma-separated phrases:
case-insensitive
between and from the corpus with smoothing of .  

Replaced African-American with African - American to match how we processed the books.
18001820184018601880190019201940196019802000(click on line/label for focus)0.00000%0.00100%0.00200%0.00300%0.00400%0.00500%0.00600%0.00700%0.00800%0.00900%NegroAfrican - American1878‪Negro‬‪African - American‬0.0003266055%0.0000009636%
Search in Google Books:

1800 - 1887 1888 - 1966 1967 - 1970 1971 - 1978 1979 - 2000 negro English

Run your own experiment! Raw data is available for download here.
© 2013 Google - Privacy & Terms - About Google - About Google Books - About Ngram Viewer