Some history of eugenics

Indeed, this "reversion towards mediocrity" was suspected by some historians to be a major contributor to the fall of the Roman Empire. The gloomy prediction of mankind's decline was dubbed dysgenics, and it was considered to be the antithesis of the eugenics movement; but it was not considered inevitable. It was believed that a society could reverse its own genetic decay by reducing breeding among the feebleminded and increasing fertility of the affluent.