Much has been made over the last few years of the prospect of a power transition taking place in world politics, as the United States' dominance of the international system appears increasingly under threat. If this narrative of American decline is at least partially correct then the United States will be forced to rebalance its foreign policy to a world that is no longer 'unambiguously unipolar'. In this report, we asked a selection of experts to assess the challenges the Obama administration has faced in making that adjustment across a series of policy areas, from redefining how America funds and uses its military, through addressing global economic imbalances, to changing how others in the world view and work with the United States. The ...