Humans wrote fantastical fictional stories for hundreds of years about going to the Moon before we actually traveled there. In recent decades, our movies and other fiction about the future frequently posit interplanetary commerce and by default assume a world government for every planet and a representative from each planet at some intergalactic governing body. As far as I know, most humans agree that only nutters believe in aliens from other planets visiting Earth. I don't know, I don't care and it's an irrelevant detail. We have a number of regional coalitions, like ASEAN and the European Union . I think the world is currently moving towards the organic emergence of a world government and our fiction that assumes a future in which a world government exists is part of the psychological process where humanity moves towards such. In any emergent human social phenomen where something new is growing out of unprecedented circumstances, there are typically competing ideas for h...