William Graham Sumner theorized that human society is based on what?

William Graham Sumner theorized that human society is based on the principle of social Darwinism, which suggests that social structures evolve similarly to biological species through competition and natural selection. He believed that individual success and societal progress arise from the survival of the fittest, where the strongest and most adaptable individuals thrive. Sumner emphasized the importance of individualism and the role of social norms and customs in shaping human interactions and institutions.