How did Charles Darwin's ideas on evolution influence Western imperialism?

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Darwin's ideas on evolution, particularly his concept of survival of the fittest, were used to justify the displacement or destruction of "weak" races by Western imperial powers. This justification was used in the name of advancing the superior race and its values, and was applied to both animal and human populations. It was used to justify genocide, land grabs, and forced assimilation, among other things. This use of Darwin's ideas helped to give scientific legitimation to the brutalities of Western imperialism.

How Did Charles Darwin's Ideas on Evolution Influence Western Imperialism