Esty’s slim book charts what he terms “declinism” to powerful effect, distinguishing declinism from decline: “Decline is a fact; declinism is a problem. American decline is happening, slowly but inevitably. It is a structural and material process. Declinism is a problem of rhetoric or belief.” This story of America on a downhill slide that Esty tells is not self-consciously set in opposition to today’s national security concerns—whether they are framed as integrated deterrence, multi-domain operations, or large-scale combat operations—but the implications of Esty’s account are profound for what America might look like on the backside of decline.