http://ngrams.googlelabs.com/graph?content=color,colour&year_start=1820 http://ngrams.googlelabs.com/graph?content=color,colour&... Note the effects of the wor

http://ngrams.googlelabs.com/graph?content=color,colour&year_start=1820 http://ngrams.googlelabs.com/graph?content=color,colour&... Note the effects of the world wars.