American anthropologists believe that the development of humanity can be split into three the stages of ignorance, barbarism and civilization, but that ignorance and barbarism have survived after the rise of civilization.
美國的人類學家認為，人類的發展可分為由愚昧到野蠻到文明三個階段，到文明之後，愚昧和野蠻也仍然存在。