"When and why do powerful countries seek to enact major changes to international order, the broad set of rules that condition behavior in world politics? This question is particularly important today, as Donald Trump's apparent disregard for the liberal international order and uncertainty over what China might seek to replace it with mean that queries about great power motives vis-à-vis order will remain at the forefront of debates over the future of world politics. In seeking to explain this phenomenon, prior studies have focused on the consensus- driven and inclusive origins of international orders. By contrast, I argue in this book that the propelling motivation for great power order building at important historical junctures has most often been exclusionary, centered around combatting other actors rather than cooperatively engaging with them. My core contention is that dominant actors pursue fundamental changes to order only when they perceive a major new threat on the horizon, a threat to their security or to their enduring primacy. When these actors seek to enact fundamentally new order principles, they do so for the purpose of targeting this perceived threat, be it another powerful state, a contrary alliance or a foreboding ideological movement. The goal of order building, then, is weakening, opposing and above all excluding that threatening entity from amassing further influence in world politics. Far from falling outside the bounds of traditional statecraft, order building is, to paraphrase Clausewitz, the continuation of power politics by other means"--