CONTEMPORARY INTRA-CORE RELATIONS AND WORLD SYSTEMS THEORY http://www.unl.ac.uk/ukrainecentre/WSS/ws-9.html
The paper was written (I believe) before the multistaged bubbleburst we're watching now, at a time when the discordance between US economic strength and its elite's aspiration for world domination seemed less acute. Nonetheless, I think it is the best thing out there.
john mage