Herbert Spencer 's ideas, like those of evolutionary progressivism, stemmed from his reading of Thomas Malthus, and his later theories were influenced by those of Darwin. However, Spencer 's major work, Progress: Its Law and Cause (1857), was released two years before the publication of Darwin 's On the Origin of Species, and First Principles was printed in 1860.
who came up with the theory of social darwinism
Herbert Spencer