Personally, with nomad cultures, I decide with each town if I'm going to Migrate my people to it (I intend to build the Migration building in the future) or if I'm going to leave the existing culture in place for a while, and only build Military Occupation.
If I'm Migrating to a new town straight away:
Before building Migration, I always destroy any town building that has '(Western Greek)' after its name in the Town panel. '(Western Greek)' doesn't mean that it IS actually Western Greek (Greeks wouldn't have building in the middle of the steppe! '(Western Greek)' actually means '(Foreign).' This shows that it's an Eleutheroi building, not affiliated to your own faction (even if the same type of building is in your own building tree). It's foreign - so I destroy it. I also destroy any building that isn't in my own building tree. If an existing building is in your building tree, and DOESN'T have '(Western Greek)' after it, then it's fine - I keep it.
If I'm just going to Occupy the town (I'm not intending to build Migration yet, just stick with Military Occupation):
Then I allow myself to keep any existing building I want (except for enemy governments and barracks.)
However, Military Occupation will usually be a temporary measure with nomads. Long-term, either they intend to Migrate their own culture to the region - or loot it and abandon it altogether. Military Occupation is simply exploiting the conquered local culture while they are still useful to me (although it's culturally demeaning to accept help from foreign outsiders, sometimes it is necessary.) Once I don't need 'help' from a foreign culture anymore, I wipe it out and migrate my own people to the region to live according to my proper traditional nomad culture.
Bookmarks