While the US has played the role of sole superpower since the decline of the Soviet Union, economic growth in China during the 1990s and 2000s has made it a major centre of economic power. Until recently, this did not translate into international political power: China hung back from intervening and supported US power. This situation now appears to be changing as the economic crisis has decisively weakened US economic power, while many areas of the world have slipped out of US control (Russia has expanded into Eastern Europe, the Middle East is undergoing a wave of turbulence, between revolutions and civil wars). And while the US was once dominant in Asia Pacific, China now appears keen to assert control over the South China Sea by building military bases, artificial islands, and patrolling the area with warships. The US has responded in kind. In sum, the situation is volatile and dangerous, and requires deeper explanation than those produced by military strategists alone. We criticise theorists tied to the regimes on both sides, arguing that globalisation has produced a real-world contradiction between territorial expansion and economic interconnectedness which is not easily solved by states and international law as it currently exists.