Google Books Ngram Viewer

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

1780 - 1833 1834 - 1928 1929 - 1939 1940 - 1994 1995 - 2008 united states are English
1780 - 1833 1834 - 1926 1927 - 1935 1936 - 1999 2000 - 2008 united states is English

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