End of the Sioux Wars is an event for 
USA that marks the end of the event chain including The Sioux Wars and Little Bighorn. The event chain is started by the decision Expedition to The Black Hills.
It requires that there are no rebels in USA. Any rebels counts in this instance, not only Dakota rebels. It has a mean time to happen of 24 months.
It decreases militancy and consciousness among Dakota POPs by 1, but it kills off 50% of all Dakota POPs in the country. Furthermore it adds Dakota as an accepted culture and makes the event Little Bighorn impossible. The two other events in the event chain can potentially raise militancy by 18 in total, so it is possible to have rebellious Dakota POPs even after the end of the Sioux Wars.
Ingame description Sitting Bull and his braves have surrendered, and the Sioux has been defeated. While there will be future battles between the tribes and ourselves, the sharp edge of the Sioux nation has now dulled. Never again will the Sioux be able to muster a force of even comparable size, and the Sioux nation's future will be resigned to the reservations. It is with some sense of mourning that we see the passing of this once great nation into the history books of our young republic.
The description will still say republic even if America has changed its government type.
The description is exactly the same as the description for the event Little Bighorn.