Admired by some and loathed by others, Spencer was one of the most discussed Victorian thinkers. An English sociologist and philosopher, he was an advocate of the theory of social Darwinism. In his vast, multi-volume System of Synthetic Philosophy, he held that the physical, organic, and social realms are interconnected and develop according to identical evolutionary principles. To describe his theory of sociocultural evolution, he coined what well-known phrase? Discuss
Source: The Free Dictionary