Google Books Ngram Viewer

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

1750 - 1863 1864 - 1966 1967 - 1970 1971 - 1979 1980 - 2008 negro English
1750 - 1796 1797 - 1969 1970 - 1982 1983 - 1995 1996 - 2008 black English
1750 - 1873 1874 - 1965 1966 - 1978 1979 - 1994 1995 - 2008 colored English

Run your own experiment! Raw data is available for download here.
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