Eugenics was a term coined in 1883 to name the scientific and social theory which advocated "race improvement" through selective human breeding. In Europe and the United States the eugenics movement found many supporters before it was finally discredited by its association with the racist ideology of Nazi Germany. Examining for the first time how eugenics was taken up by scientists and social reformers in Latin America, Nancy Leys Stepan compares the eugenics movements in Mexico, Brazil, and Argentina with the more familiar cases of Britain, the United States, and Germany.