The 1990 Modified Age/Race, Sex, and Hispanic Origin (MARS) files provide data from the 1990 census that has been "modified" to assign each of the persons in the "other race" category to a specific race. This was done to make the census data consistent with the four race categories (within Hispanic or Not Hispanic) used in other census surveys White; Black; Asian and Pacific Islander; and American Indian, Eskimo, and Aleut.