Ok, here we go again.
The Solomani are a proud people with a rich diverse set of traditions that bind them under a single government. They resent tyranny and call themselves a confederation. However, underlying the structures of their democracy lies a powerful idea (the Solomani Cause) akin to the compact of five in the Federal Council. Each world contributes to a pooled Army, Navy, SolSec which akin to the Swiss army of old. As you go through those mountain passes ever notice how many tanks stand guard?
The Democracy that the Swiss and the Solomani are both so proud of leads to consider economic freedom and almost a laissez faire type society but underneath lies the need for order hence the multiple permits and visas needed for the conducting of business. Both are relatively stable although centrifugal forces by neighboring states continuously pull at them but yet remain having a constant identity - Swiss or Solomani.
Strongly individualistic and anti-collectivist yet bind themselves into a common project. Very weak central government but enforced by strong institutions.
Starting to sound like the Solomani to you now.
Oh, yeah, the Solomani brought chocolate addiction to the Stars.