Some call it the second earth. But for humans it's home.
Originally discovered by explorers from the remains of the old Allied American States, the name Legion was at the time used to describe the vast diaspora of human culture, a generalization for the rest of the Big Seven to call this new race by. While the remaining planets and other local systems were claimed in the name of other cultural/political factions, the Olympus system was quickly established as the unified face of the human race. The various governments that remained after the loss of the Sol System in the Cataclysm rallied to this central front, and remain there today, overseeing the various needs of mankind as it expands its reach through space.