Google Books Ngram Viewer

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

1750 - 1800 1801 1802 1803 - 1945 1946 - 2008 these united states English
1750 - 1791 1792 - 1821 1822 1823 - 1980 1981 - 2008 the united states English

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