The theory of natural selection, which is susceptible to individuals, groups, peoples, as well as animals and plants, is called Darwinism.
Today this theory has been discredited, but at the end of the 19th and early 20th centuries, it was the basis for the appearance of the Social Darwinism, advocated by British philosopher and scientist, Herbert Spencer.
According to this theory, the life of people in society is a struggle, where only the strongest, most capable, chosen by natural selection, survive.
Thus, this theory helped to consolidate racism, conservatism and imperialism, while discouraging reforms. The social order, according to Social Darwinism, is a result of natural sellection, in which the most capable and strongest are ruling.