Well, as I wrote, Kepler and Bering belong to the SEU. Kepler is important because of Ames Research Station helping the SEU with the development of its own warships.
I guess Bering's Freeport 2 could go to the Northern Systems though, and therefor be fully independent.
>> "Northern Systems" is not a union like the SEU, it's just all the other Zoners that dont belong to the Southern Union. So, basically all the independent Zoners.