Philosophical conceptions of justice have most often been directed at the nature of a just state. But many contemporary issues of justice reach across boundaries. Are our immigration policies fair and just? Can a just state invade another state in order to outfit it with a more just government? Can we defend economic policies that improve the lives of our citizens but an adverse impact on economies abroad? John and Ken look beyond with Martha Nussbaum from the University of Chicago, author of Frontiers of Justice: Disability, Nationality, Species Membership.