Believed that human societies pass through an evolutionary process Darwin explained in his theory of natural selection. Coined the term "survival of the fittest". First to believe that human societies evolved according to the principles of natural laws. That societies that have adapted to their surroundings and cam compete will survive. Those that have not adapted and cannot compete will encounter difficulties and will, eventually, die. Believed that societies evolved from relative homogeneity and simplicity to heterogeneity and complexity.
