So let’s play strategy czar. You are a 21st-century Kissinger. Your task is to guide the next American president (and the one after that) from the demise of American hegemony into a world of much more diffuse governance. What do you advise, concretely, to mitigate the effects of the past decade’s policies — those that inspired defiance rather than cooperation — and to set in motion a virtuous circle of policies that lead to global equilibrium rather than a balance of power against the U.S.?