Kant’s political philosophy is by now an established field of research with an ever-increasing number of publications devoted to it. Macarena Marey’s new book, the title of which in English is: Omnilateral Will and the Finitude of the Earth: A Reading of Kant’s Political Philosophy,1 offers a thorough and thought-provoking contribution to this field, with an emphasis on three interpretative claims: (1) all juridical normativity must emanate from a concrete form of omnilateral legislation; (2) present-day injustices, and in particular the asymmetry of power between richer countries of the Global North and poorer countries of the Global South, can be produc- tively rethought through a Kantian idea of popular sovereignty; and (3) property rights remain illegitimate until a truly omnilateral and reciprocal public will is estab- lished. Two conclusions follow from these claims: first, that the current international order of post-Westphalian states will continue to reproduce unequal power relations unless inter-state normativity is reshaped by a principle of popular sovereignty; and secondly, that in order to bring about such a world, Kant can help.