Thirty years ago, while basking in the dawn of U.S. hyperpower, imperial policymakers liked to say that “superpowers don’t do windows”—that is, the unglamorous, menial tasks of hegemony, which ought to be performed by client states. We are a long way from that now. The Iraq War (and then the Afghanistan surge) showed that even at the height of U.S. unipolarity, there were serious political limits to the participation of partner militaries in unpopular American wars of choice. Now, at the historical end of U.S. unipolarity, there simply was never going to be any appetite to save the Americans from their own mistakes.