Yes, well, I was wondering what the whole 'pigmented citizens' thing was about.
Space apartheid, I take it?
Sadly that's pretty much it, the downside of trying to write realistic sci-fi is that it does rather tend to the grim. The UEG is influenced by quite a few countries but particularly Rhodesia and the early American West, its that frontier intolerance of anyone but the settlers attitude. Its a fairly racially, socially and economically segregated society. In the setting the overwhelming majority have very pale white skin (the result of actually being a GM "Colonial" species of Human prepared by the Old Imperials) but a small minority produce pigments in their skin leading to colouration (a bit more randomly than our racial distinctions).