Rochambeau's brutal tactics helped unite black, mulatto, and mestizo soldiers against the French. In 1867 Sally Dunning married Anthony Bush, a mulatto freedman. Lincoln also received mail that called him "a negro" and a "mulatto". The English term "mulatto" is derived from the Spanish and Portuguese "mulato". She proves to be of American Mulatto ancestry. In the 2000 United States Census, 6,171 Americans self-identified as having mulatto ancestry. In 1799 there were some twenty mulatto (mixed race) slaves at Mount Vernon. A different survey in 2006 reported 67.6% mulatto and indio, 18.3% black, and 13.6% white. As in other Latin cultures, there were looser borders with the mulatto or mixed-race population. Dwight D. Eisenhower's mother was said to be of mixed blood from Africa and mulatto. Scholars such as Werner Sollors cast doubt on the mule etymology for mulatto. She tearfully looks at the photo of a well dressed mulatto man. They projected this belief back onto the etymology of the word mulatto. Enumerators were instructed to no longer use the "Mulatto" classification. But, the inclusion of mulatto was an explicit acknowledgement of mixed race.