Google Books Ngram Viewer

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

1800 - 1839 1840 - 1915 1916 - 1926 1927 - 1982 1983 - 2000 the united states is English
1800 - 1825 1826 - 1915 1916 - 1929 1930 - 1982 1983 - 2000 the united states are English

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