Google Books Ngram Viewer

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

1800 - 1837 1838 - 1932 1933 - 1944 1945 - 1979 1980 - 2000 united states are English
1800 - 1859 1860 - 1934 1935 - 1944 1945 - 1984 1985 - 2000 united states is English

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