Humanity lost more ships at Alpha Centauri then in any other system during The War. The warehouses, the elevators, the hyperspace runs, everything about it made Alpha Centauri more valuable than any system short of Terra itself. And some people considered it more important than that. The riches that flowed through it, the starships that could use it, and defenses that held it all made Alpha Centauri an amazing target for the Shang and the Chinese. They wanted to drive us out. We wanted the same thing. None of us got everything we wanted in that deal, and we lost far too many ships before the end came. But trade must continue, and so it did, and so it has.