Social Darwinism is a modern name given to various theories of society which emerged in the United Kingdom, North America, and Western Europe in the 1870s, and which claim to apply biological concepts of natural selection and survival of the fittest to sociology and politics. Economically, social Darwinists argue that the strong should see their wealth and  power increase while the weak should see their wealth and power decrease. Different social-Darwinist groups have differing views about which groups of people are considered to be the strong and which groups of people are considered to be the weak, and they also hold different opinions about the precise mechanisms that should be used to reward strength and punish weakness. Many such views stress competition between individuals in laissez-faire capitalism, while others are claimed to have motivated ideas of eugenics, racism, imperialism, fascism, Nazism, and struggle between national or racial groups.