[Astromancer]

Try this idea, Travelers from a parallel Earth in an inaccessible quantum land in this Q6 world around 4,000 BCE. The travelers think they've escaped from a brutal totalitarian dictatorship into their distant past. The lost travelers vote to start humanity on a better path by refounding society in a better form.

Fifty years after their crash the city they founded is a vibrant democracy with a strong economy, the local Tech Level is functionally TL5 with small amounts of higher Tech level items around.

Two hundred years after the landing, Spain, France, Morocco, Italy, and Scilly, are a vibrant growing democratic nation functioning at TL8, and planning to overwrite the horrors of their history with a universal democracy. Meanwhile, other lost travelers from a nearby Q6 world have discovered this world also believing they've traveled into their past.

As far as the second group of travelers are concerned, the first group is trying to wipe them out. The group that got to this quantum first sees the second group as the unwitting dupes of the dictators the first group fled from. War is now in bloom.

Homeline has just found this world with two groups of unwitting Crosstime travelers. Handle this hot potato without massive slaughter and brutality, or face a political backlash on Homeline.

Note: Either failing to solve the problem or slaughtering massive numbers of people, will cause massive political issues for your group.