Google Books Ngram Viewer

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

1770 - 1812 1813 - 1825 1826 - 1835 1836 - 1938 1939 - 2008 the united states are English
1770 - 1906 1907 - 1942 1943 - 1952 1953 - 1996 1997 - 2008 the united states is English

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