Book excerpt: As the international economy globalises, there is a need for national infrastructure systems to adapt to form a global infrastructure system. This network of networks aids mobility between national systems as a means of supporting their territorial needs and preferences. This reflects a strategic approach to state infrastructuring as nations seek to utilise these physical systems to support and enhance their territoriality. Providing a thorough examination through the lens of economic infrastructure, the book addresses the forces of integration and fragmentation in global networks. This book explores the trend towards the development of regional infrastructure systems within the context of territorial strategy. Regional systems emerge out of states seeking to position themselves within the international system. Colin Turner identifies the diverse processes that are driving regional infrastructures, as well as examining the formal and informal patterns of integration that are shaping developments. This book is ideal for international political economy and regional development scholars who seek an advanced understanding of current regional infrastructure systems. It will also serve as a vital tool for practitioners who need to understand the implications for policy-making.