One of the long-standing schisms in the philosophy of history concerns the role of individuals in social change.
One faction sees individuals (as seen in Dickens' A Tale of Two Cities and Thomas Carlyle's The French Revolution, A History) as the motive power of history, and the broader society as the page on which they write their acts. The other sees society as moving according to holistic principles or laws, and sees individuals as its more-or-less willing pawns. In 1880, James waded into this controversy with "Great Men, Great Thoughts, and the Environment," an essay published in the Atlantic Monthly. He took Carlyle's side, but without Carlyle's one-sided emphasis on the political/military sphere, upon heroes as the founders or overthrowers of states and empires.
A philosopher, according to James, must accept geniuses as a given entity the same way as a biologist accepts as an entity Darwin's ‘spontaneous variations.’ The role of an individual will depend on the degree of its conformity with the social environment, epoch, moment, etc.
James introduces a notion of receptivities of the moment. The societies' mutations from generation to generation are determined (directly or indirectly) mainly by the acts or examples of individuals whose genius was so adapted to the receptivities of the moment or whose accidental position of authority was so critical that they became ferments, initiators of movements, setters of precedent or fashion, centers of corruption, or destroyers of other persons, whose gifts, had they had free play, would have led society in another direction.