ABSTRACT The historical context of early post-Kantian debates on politics reveals the emergence of a new type of perfectionist ethics no longer based on the state-sponsored promotion of happiness, as the dominant German tendency in the eighteenth century had been, but on individual freedom. Post-Kantian perfectionism focused on maintaining and enhancing the conditions for rightful interaction among self-defining individuals. Rather than isolating and alienating, Kantian negative freedom enabled a new conception of social interaction based on the idea of right and (...) the progressive extension of rightful relations. Humboldt, Schiller, Fichte, and Marx exemplified this new approach, despite their differences. (shrink)