The Triumph of EvolutionHamilton Cravens challenges widespread belief to argue that the impact of evolutionary ideas on American culture and science has been greater since the collapse of Social Darwinism. he portrays a new generation of American scientists whose pioneering work led to the bitterly debated heredity environment controversy in the 1920s and then, in the '30s, to a "synthetic" theory of the way heredity and environment together have shaped human nature and