By Prof Francesca Strumia, The City Law School
Set under the palms of Florida’s Key West, the Truman Little White House, originally a winter retreat for US President Harry Truman and now a public museum, has at first sight little to say about law, let alone cosmopolitan law. Yet the sign outside its gate adds a cosmopolitan touch to the history of the building. It points out that the Little White House is ‘held in trust by the state for the citizens of the world’.
In hinting to something that the state, the state of Florida in this case, does for the citizens of the world, the sign evokes an unsolved conundrum of international law and legal theory: does the sovereign state owe any legal duties, beyond its citizens and its jurisdiction, to humanity at large? And if so, why?
These questions about the cosmopolitan role of the sovereign state have grown more pressing as the first quarter of the 21st century slides towards its end. The sovereign state remains the main actor in the international arena. Yet the challenges it faces are increasingly of a type that affects the entire human race: climate change; energy provision; security of data and identities in a borderless cyberspace; as well as the global movement of people. In the face of such challenges, a vision of the sovereign state as the mere guardian of its territory and people is increasingly inadequate.