Fiction:The Civilisation

"The Civilization" (also known as Civilized galaxy, Milky Way cooperative or simply Civilization) is the term for a powerful overarching civilization in the Milky Way galaxy which emerges from many empires working together for a common goal. Neither an alliance or organization, each empire is still independant from each other.

Purpose
After the ancient first empires left the galaxy, it was up to the DCP to protect it. However, after the Imperial Civil War, and recent previous ones, the galaxy was left in a terrible state, the more powerful empires left and the weaker ones were merged or destroyed and the Grox had been wiped off the face of the galaxy. Many empires were struggling, and to prevent yet another war, the DCP decided to put the galaxy into a new phase of evolution, instead of warring, empires would get common goals by working together. Every empire working together then forms a Meta-civilization, which arises between this new cooperation.
 * Each empire is independant, and can still go to war with other empires also in Civilization. Each member is still limited to its tier level, but overall, every member becomes a Tier 1.  The DCP has donated some (but not nearly all) of their advanced technology, such as astroenginnering and stellar engines, however, empires must work together with them.

History
Before, there were so many empires in the galaxy, often so alien to each other, most empires and societies would ignore each other, but out of desperation, soon willingly began to work with other empires to establish the civilized galaxy.