The global crisis of our time involves a complex of ecological, economic, technological and migratory challenges that no state is able to control. The result is a provincialisation of our democracies with respect to the new planetary powers confronting humanity. It is from this that our increasingly impotent and rabid politics stems. Paradoxical as it may seem, it is precisely the decline of the nation-state that is the source of the great nationalist uprising of our time.We need a new planetary vision that is able to reclaim and liberate our world, starting today and engaging each of us. This is the task of philosophy as much as it is of politics, of theory as it is of activism. Connecting with a new generation taking to the streets across the globe, this book tells the story of the ever-closer union of our world, from the age of empire to the climate crisis, and presents a plea and a roadmap to step beyond the mental and material boundaries of our nations.