Google Books Ngram Viewer

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

1800 - 1841 1842 - 1917 1918 - 1928 1929 - 1983 1984 - 2000 united states is English
1800 - 1823 1824 - 1912 1913 - 1926 1927 - 1980 1981 - 2000 united states are English

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