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Faction name: "The Commonwealth"
Species: Those that live in the Commonwealth are generally refered to as "mankind" the majority of mankind descend from humans, often with some degree of adaptation to colonized planets. 
Member of Interstellar Concordance: Yes
Important Characters: W.I.P
Representative: "Metatron" a single representative for such a large civilization goes against the cyberdemocratic values of the commonwealth. Metatron is more a government organization than a single person. An "Avatar" of the Commonwealth as a whole.
Description of Civilization: The commonwealth is a technological system of government designed by "The Second Solar Imperium" long ago, most positions of the government were run by automated systems (much to the chagrim of politicians across Imperium space). While planets integrated into the Commonwealth retained some degree of government, each planet is given an "Advisor" which advances the agenda of the commonwealth as a whole, and guides the developement of the colony...which sometimes leads to the old government falling out of favor. The population of the commonwealth is diverse, while most trace roots back to ancient earth, others are members of less advanced alien civilizations absorbed into the commonwealth over the coarse of hundreds of years. They remember when the "Angels" came and slowly introduced life-changing technology. Different subcultures have different views of the Commonwealth they inhabit. While they are part of the Concordance, others are weary of imperialistic tendencies.



Advantages and disadvantages:
+high technology (Most notably bio and cyber-technology has advanced to the point where the majority of inhabitants don't really differentiate between the two. Artificial life is abundant)
+high standard of living due to widespread automation
=Diversity
-Rogue systems, parts of the commonwealth that have been subverted through digital or memetic memes, some of these seek to destroy the commonwealth for various reasons. Sapient Computer viruses (some sapient computer viruses are official citizens, but have to obey the law like everyone else!)
-Terrorists
-current FTL tech lags behind some of the other advanced civilizations, its not bad, but it could use improvement