Social Darwinism, the theory that human groups and races are subject to the same laws of natural selection as Charles Darwin had perceived in plants and animals in nature. According to the theory, which was popular in the late 19th and early 20th centuries, the weak were diminished and their cultures delimited while the strong grew in power and in cultural influence over the weak. Social Darwinists held that the life of humans in society was a struggle for existence ruled by survival of the fittest, a phrase proposed by the British philosopher and scientist Herbert Spencer.

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biology, philosophy of: Evolutionary ethics

form of evolutionary ethics is social Darwinism, though this view owes far more to Herbert Spencer than it does to Darwin himself. It begins with the assumption that in the natural world the struggle for existence is good, because it leads to the evolution of animals that are better adapted

The social Darwinistsnotably Spencer and Walter Bagehot in England and William Graham Sumner in the United Statesbelieved that the process of natural selection acting on variations in the population would result in the survival of the best competitors and in continuing improvement in the population. Societies were viewed as organisms that evolve in this manner.

The theory was used to support laissez-faire capitalism and political conservatism. Class stratification was justified on the basis of natural inequalities among individuals, for the control of property was said to be a correlate of superior and inherent moral attributes such as industriousness, temperance, and frugality. Attempts to reform society through state intervention or other means would, therefore, interfere with natural processes; unrestricted competition and defense of the status quo were in accord with biological selection. The poor were the unfit and should not be aided; in the struggle for existence, wealth was a sign of success. At the societal level, social Darwinism was used as a philosophical rationalization for imperialist, colonialist, and racist policies, sustaining belief in Anglo-Saxon or Aryan cultural and biological superiority.

Social Darwinism declined during the 20th century as an expanded knowledge of biological, social, and cultural phenomena undermined, rather than supported, its basic tenets.

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social Darwinism | Definition & Facts | Britannica.com