Was Darwin a Social Darwinist?

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…United States, 1900-1920. New York: W.W. Norton and Co., 1990. Darwin, Charles. The Descent of Man and Selection in Relation to Sex. New York: Appleton and Co., 1883. Darwin, Charles. On the Origin of Species. New York: Grammercy, 1998. Heyer, Paul. Nature, Human Nature, and Society. London: Greenwood P, 1982. Hudson, William Henry. An Introduction to the Philosophy of Herbert Spencer. Haskell House Publishers: New York, 1974. Spencer, Herbert. The Data of Ethics. New York: D. Appleton and Company, 1895.