This short book outlines the case for border abolition as the only viable response to the nightmarish realities of our present. It develops a thoroughgoing critique of contemporary border regimes, while identifying critical openings for alternative futures. Ours is the age of borders and walls. The government of mobility has become the central problem of the 21st century, as states develop new and terrifying ways to fix and manage unequal populations in space and in law. The violence of borders is everywhere visible: in the brutality of the UK's hostile environment, clarified in chilling...