Carja
The Carja are a far more civilized tribe than the Nora. You’ll find them in and around Meridian, often referred to as the City of the Sun.
This tribe is more focused on trading and commerce compared to the other tribes of Horizon Zero Dawn, and as such, the city of Meridian is teeming with merchants for you to visit. Meridian as a whole feels like the most developed area of the entirety of Horizon Zero Dawn, with its large stone structures surpassing any architecture by the Nora tribe.
Unfortunately, the Carja tribe has a rather dark past. The former Sun-King Jiran waged war against the other tribes for sacrificial slaves, and the tyranny didn’t stop until his progressive son, Avad, put an end to the war. This hasn’t left them on the best terms with most other groups, though the initial mutterings of forgiveness can be heard from passersby on your journey.