Earth 39

In this reality, humans have found and colonized a galaxy containing earth-like planets. These planets were originally inhabited by a race of peaceful, agrarian, vaguely humanoid aliens, called the Niadnes. Humans came in and conquered them using human diseases and technology. The natives are still around, just forced onto reservations or assimilated into human society. Human technology and society, after many years of disconnect with their homeworld, has regressed to be similar to the American Wild West of the 1800s, but with spaceships. There are several factions:
Herders: they herd local beasts around from their breeding grounds to the populated planets, often using worn out old cargo ships.
Outlaws: they operate entirely through thievery, murder, backstabbing, and general bad things. They tend to use highly weapons-oriented ships with hidden smuggling hatches.
Lawmen: They travel through the land fighting for order and justice in the largely lawless galaxy. They tend to operate alone, in one or two man ships with more emphasis on defense.
Niadnes can be found either integrated with the other factions or on reservations on the planets humans were not interested in.