Territory ownership

I know how to resolve the world, zone and facilities. But is there any way to retrieve the current zone ownership without having to iterate over the history of events?

 

Yes, you need to get the "map" data, which lists all of the regions and which faction controls it.

This will get you the list for Indar, Esamir, and Amerish on Connery:
https://census.daybreakgames.com/s:example/get/ps2:v2/map?zone_ids=2,6,8&c:lang=en&world_id=1

The data is structured a little strangely, and the ID values are labelled differently, but it's pretty easy to tie that back to the data you already have,