[] Bring them back in line (Increases Centralization if successful, decreases stability if not)
Puts in controls over corruption and favoritism, but naturally the chiefs won't be happy.
[] Let the matter lie
Let thing go as they naturally would. Develop...politics.
[] Delegate further responsibilities to the local chiefs (Changes government type to Central Oligarchy)
Disperses power to a more equitable distribution, which helps buffer stability hits as local issues are more likely to be addressed locally, but reduces ability to coordinate.
It actually has synergy with Land of Opportunity, since it'd help cover for 'digesting' large numbers of refugees.
[] Join the Spirit Talkers
This prevents a later conflict from rounding on us, as the Spirit Talkers have the best military here at present, if we team up with them.
The Spirit Talkers have backed us up in the last Nomad war, so reciprocity may be in order
On the other hand nobody LIKES them...
[] Join the Western Confederacy
Backs up our oldest trade partners, and the Western Confederacy are currently closer to our values than the Spirit Talkers.
However, the Spirit Talkers are likely to declare war on them after the Dead Priests and they didn't help US significantly when we called for help.
[] Stay out of it
Where Eagles fight, Crows feast.
Just grab some popcorn, watch everyone else wreck everyone else, then press Land of Opportunity button to digest everything.
[] Western Confederacy (Probably Pioneering Spirit again)
Pioneering Spirit becomes very dangerous here, since we'd be taking stability drops and thus Centralization drops every time our neighbors suffer a disaster. We'd not have trouble feeding them, but we'd lose ability to manage them.
[] Spirit Talkers (Probably spiritual based)
I'm willing to bet the Spirit Talkers trait is something to offset Stability losses via Mysticism(since they'd be wrecked otherwise).
Extremely useful due to Land of Opportunity
[] Northern nomads (Probably honour based)
Honor leads to discipline, but also leads to blood feuds. Helps enrich our warrior caste certainly with a code of conduct.
[X] Bring them back in line (Increases Centralization if sucessful, decreases stability if not)
[X] Stay out of it
[X] Spirit Talkers (Probably spiritual based)
Personal preference is to exploit the hell out of the mysticism.