Well I really hope there is two UN forces. The NUNS and OLD UNS. I only think of this because why would the President of UNG be on a colony fleet? Woulden't that put him and his government in danger? If the two different UNS is true, than he could be president of NUNS heading to find their own Planet while leaving the old UNG and current President/Government behind on Earth?
Something maybe like...
UNG: Ok you can go ahead and be your own government, just not on Earth, this our terf! GTFO!
NUNS: Ok! All who want to go be free from UNG and live freely with Implants and Macroned Zents, come with us! We will have Hippo-cows!
Ok the above fake convo is obviously just a joke to fit my theory
If the UN Civil War (what ever it was) happened than it would be assumed that the seperatists won and did not reform the UNG in my theory.
Meh, my theory mainly sucks. But just my horrible theory on it...