At the core of the logic of this book is that states engage in infrastructuring as a means of securing and enhancing their territoriality. By positioning infrastructure as a system, there is a presumption that all infrastructures exhibit some degree of mutual dependence. As such, a National Infrastructure System (NIS) is not simply about conventional conceptions of infrastructure based on those that support economic activity (i.e. energy, transport and information) but also about broader hard and soft structures that both enable and are supported by the aforementioned economic infrastructures. Consequently, this book offers an ambitious holistic view on the form of NIS arguing that the infrastructural mandate requires a conception of the state that encapsulates themes from both the competition and the welfare states in infrastructure provision.