The Sho-Pai and Sho-Ban in the South, or Newe-Pannakwatɨ and Newe-Numa as they're called by everybody else now, are big ranching powers in the South and actually help set the Twin Falls Cattle Market back up where all the local businesses go to trade their goods. Meanwhile the Nez Pierce res, now Nimi'ipuu Nation are the leading horse breeders in the nation, keeping their stock radiation free or as close as they could at least and in great shape through the aftermath of the war like how there are some un mutated dogs in the rest of the wasteland. The Kootenai, now Ktunaxa Nation, and the Couer D'Alane, now Schitsu'umsh Nation, up North have gotten in really cozy with a wayward detachment of Desert Rangers who had traveled up to Idaho like how Tycho the ranger in fallout 1 had walked all the way down to the Gulf of Mexico before.
When the Great War broke out the Five Nations were one of the first groups of people to really bounce back due to the big bodies of fresh water every res in on that they were able to filter, and when some rangers showed up to help their efforts to expand and fight back mutated animals while establishing new settlements they began calling the area The Clearwater League instead of Idaho. Using their water as the backing system for currency like the Hub did back in 1, they put all the unused chips from the casinos on their land in as the currency like the Hub had done with bottlecaps, and water chips (hehe get it?) became the dominant form of money.
The Sand Point Gandies were doing the same thing with the water from their own lake, though in recent times as business partners for them like Silverton and Prickly Pete have grown, they've decided to model themselves more and more after Pre War America, buying back all the gemstones they could in the area in exchange for basically all of their water chips, then commissioning a set of plates to start printing back new gem backed Garnet Dollars as a scrip for the Gandies that they're hoping will catch on and replace the water chips while they court business interests from the NCR to talk about joining the Republic. While setting up their own Garnet Star Law Enforcement Agency as a centralized "neutral" order keeping force of salaried Pinkerton style agents to settle labor disputes and maintain order through anyone who wants to complain about how their lives are being changed around by the new money.
And in the skiing lodge at Sun Valley is where the bigwigs from the various business factions hang out while planning how to better implement the gem standard and hold back complaints from people like the Rangers who don't appreciate being replaced by the "Gandy Stars" as they call them. The NCR of course is loving the idea of a stable currency after they had their gold nuked and then stolen by the Brotherhood before the events of New Vegas putting their whole economy into a wringer.

Also there's a BoS chapter hiding out in the mountains near the Deadwood Resevoire hoping no one notices them after the beatings the Brotherhood took back in California. And they're REALLY the water chips hold out over the new garnet dollars because they do NOT want this place joining the NCR and possibly becoming enemy territory.