The following contains spoilers for the Yellowstone season 5 finale.Gil Birmingham, who plays Chief Thomas Rainwater in Yellowstone, talks about whether they’ll honor the treaty between him and Kayce. The series finale brings the story at large in a full cycle, tracing back to the Dutton ancestors who settled on the land 141 years ago in the prequel series 1883, fulfilling the promise to return the land to the Indigenous people. In the Yellowstone series finale, the Yellowstone Ranch is sold back to Rainwater and the Broken Rock Reservation with the condition to keep the land undeveloped, while Kayce and his family get to live on a small portion.

https://screenrant.com/yellowstone-series-finale-kayce-rainwater-treaty-honor-gil-birmingham-response/