Full Idea
Utilitarianism is a universalist ethic, so the political realisation of this ethic would seem to be a world state seeking to maximise happiness for the world's population.
Gist of Idea
The universalism of utilitarianism implies a world state
Source
John Charvet (Liberalism: the basics [2019], 12)
Book Reference
Charvet,John: 'Liberalism: the basics' [Routledge 2019], p.157
A Reaction
It certainly doesn't seem to favour the citizens of the state where it is implemented, since miserable people just across the border would have priority, and all miserable migrants must be welcomed. There is no loyalty to citizens.