My sister has been saying this quote for about a month and says it has historical significance. After searching I can't find anything. What famous person said "Lafayette we are here!"?
closed as off-topic by American Luke, Gwenn, Eugene Seidel, Kobunite, Monster Truck Aug 8 '13 at 11:50
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A quick Google search solves this question.
That statement cites http://www.unc.edu/depts/diplomat/AD_Issues/amdipl_16/edit16_print.html as the source. Here is a quotation
This page cites Black Jack: The Life and Times of John J. Pershing (1977), vol. II, 724 by Frank E. Vandiver.
The Wikipedia page on Stanton says
Wikipedia cites George, John H. and Paul Boller's They Never Said It (1989)
Most of the evidence that Stanton said the quote in question comes from Pershing himself, who denied that he authored the phrase.
There is some evidence (although much less credible) that Pershing did in fact say this phrase first.
However, the article I just cited seems to be the only place that gives credence to Pershing saying the phrase. However, the article doesn't even cite any sources.
I would conclude that Col. Charles E. Stanton himself said the phrase, "Lafayette, we are here".