In 1967, C.L.R. James, the much-celebrated Afro-Trinidadian Marxist, stated that he knew of no figure in history who had "such tremendous influence on such widely separated spheres of humanity" within a few years of his death as the eighteenth-century philosopher Jean-Jacques Rousseau. While this impact was most pronounced in revolutionary politics inspired by political theories that rejected basing political authority in monarchy, aristocracy, and...