The weak form of the impossibility objection — that global political union cannot be formed at all — is undermined by existing examples

It is often argued that it is impossible to change the current system of states and to form a world–state or a global federation of states. This claim is hard to maintain, however, in the face of the existence of the United Nations, the existence of states with more than a billion people of heterogeneous backgrounds, and the experience with the United States and the European Union. So in order to be taken seriously, the objection must instead be that it is impossible to form a good state or fede