Google Books Ngram Viewer

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

1800 - 1863 1864 - 1868 1869 - 1902 1903 - 1974 1975 - 2000 confederate flag English

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