Jack of Harts

The Alpha Centauri B system contains three terrestrial worlds, two of them easily habitable, two gas giants, an asteroid belt, and nine major moons.  The asteroid belt, the remains of what might have been a planet were it not for the tidal forces of Cen A, grants easy access to raw materials.  This, amongst many other factors, makes the star system the greatest center of production and mining short of the Terran system herself.