I completely forgot about Banished. We could do something like that, with each of our groups negotiating trades using the leaders (us).

A few hundred years in the future the groups would have changed enough that we don't need to know a lot about them. Just read a wikipedia article on them, and we'll have the basics.

Or we could be new groups, completely made up.

Edit: Ok, plot idea so far:
It's 2157. Only Mars and the moon are colonized, because the government couldn't control anything in the outer system given current technology.
I own a ship-building and research facility in the asteroid belt that is trying to design ships for deep space exploration. I detect a signal from an old NASA probe in the Centari system. It detected a planet in orbit of Alpha Centauri that has liquid water, is in a decent orbit, has 22% atmospheric oxygen, but at less than half Earth pressure, and Chlorophyll using lifeforms. 59% probability it can support human life, given the much worse technology of when the probe was launched. I only detected the signal because I built equipment to pick up signals from all of the old satellites and probes, something only the government is likely to still do.
I design a ship, using my prototype warp drive (50c, so just over a month to get there), and build it, while contacting various oppressed groups on the planet and asking them if they want to join us. Some (you guys) agree. I build a ship for each group (overextending my corporation's resources in the process, but who cares, I'm abandoning it) and we leave. For groups like the Amish, I merely take you there, as you reject the idea of owning something as advanced as a starship. My group is made up of 1000 or so asteroid miners and other "spacer" types who already don't need a government.
Some time after we leave, the UN (now a planet-wide oppressive government) realizes where we went, recovers what they can of my research, and launches ships to go after us.