States do not always resist a threatening adversary, even one that endangers them directly. This is partly due to the wide disparities in capabilities that characterize the international arena: Weaker states often stand to gain more from conciliating or aligning with an aggressor than they do from standing up to it. But as Randall Schweller argues, incentives to bandwagon also inhere in the structurally-determined predispositions of the states that confront an evidently expansionist adversary.