The whole international system, UN, World Bank and IMF and WTO were set up to the US specification when the US was powerful enough to dictate the terms and control the institutions. Under Bush the US has been trying to undermine the international system because since the 1990's it is increasingly unable to control it. the "Saner" US presidential candidates want to reassert control, while the others will continue with the dismantling. But the US will rather retreat into isolationism than accept being an equal to any other entities.

We have met the enemy, and he is us — Pogo