One ardent supporter of functionalism has been David Mitrany. In his authoritative work, A Working Peace System, Mitrany argues that the world has become so “closely interrelated,” that one issue in one part of the world has been affecting other peoples living in other parts of the world. This suggests in fact that human beings have become “one indivisible community” (Mitrany, 1966: 13 and 37). Meeting the needs of this community, according to Mitrany, requires a different approach than we have now- the territorial organization of the world by nation-states. However, nation-states, so the argument goes, are reluctant to give up their sovereignty.