in the campaign map you should call the factions like in a modern map , that is , the political name
even that is very hard
let us take rome as an example , these are the options -
1. rome (the city itself in english)
2. roma (the city itself in latin)
3. senatus popolusque que romanum (the senate and the roman people in latin , a political term)
4. imperium romanum (all the territories that were under roman control - roman empire)
5. quirites (after the first roman king , romulus-quiritus)
6. just romans
7. the res publica or roman republic (we should remember that rome was a rebublic until 44 or 27 bce)
etc'

so again , in modern political maps we see political names and that should be the choice (for examples - french republic and not the land of the french , us of a and not the americans territories , the state of israel and not the jewish state etc')