Confederation State of Earth
From the Corporation's metropolis-planet to Pirate guild's mega-network, Human has long expanded themselves beyond the solar system, to the point where everything is stabilized, and live distributively on the galaxy.
Confederation State of Earth( C.S.E.) is the oldest and largest nation, directly ruled by the Earth. Anyone who wants to colonize can be funded by them, with the cost of tax. The more planet colonized, the more powerful it has.
It was too powerful that once the earth was destroyed by the major catastrophe, all colonies who want to be the peak of structure, were fighting against themselves, leading to the bloody and scary result.