I envision that at first there will be some random pmlace where people will start joining, that would end up being a major trade hub.
This would happen repeatedly during alpha and beta stages and re-built after wipes, as players figure out how to optimize.
Once DU goes live, this would be the main hub, for no other reason than history, and because humans have a tendency to create these centers, and expand from them.
Not sure how territory ownership would support an independent place other than this being in a safe zone, and if you have a chance, could build there your hangar/house.