Data are tabulated showing that on diverse traits including brain size and intelligence, maturational delay, sexual restraint, quiescent temperament, and social organization, the Caucasoid average falls between those of Mongoloids and Negroids. The r-K continuum of reproductive strategies, based on macro-scale comparisons across species, can be used to help explain this micro-scale of human differences. Although democratic ideals are compatible with Darwinian theory, they do not compel us to believe in biological uniformity.