Google Books Ngram Viewer

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

1800 - 1907 1908 - 1942 1943 - 1952 1953 - 1996 1997 - 2008 the united states is English
1800 - 1818 1819 - 1831 1832 - 1841 1842 - 1936 1937 - 2008 the united states are English

Run your own experiment! Raw data is available for download here.
© 2013 Google - Privacy & Terms - About Google - About Google Books - About Ngram Viewer