This book argues that the technological revolutions of the twenty-first century are transforming the foundations of global politics. The competition between great powers no longer concerns supremacy within the existing world but the power to (re)build the world itself. ‘Geopolitics is the struggle not to control territory but to create the territory.’ Artificial intelligence, quantum computing, telecommunications, green energy, and related technologies define this emerging order, while events such as the COVID-19 pandemic and the climate crisis reveal humanity’s growing need to construct ‘secondary worlds’ insulated from nature’s volatility. A Prologue introduces the idea of world building, an Introduction outlines the new geopolitics, and four chronological chapters trace the evolution of this technological order, followed by a conclusion. Across these sections, Maçães draws on analogies from gaming, cybernetics, and fantasy sagas to depict a global competition where a few ‘world builders’ act as programmers shaping the systems in which others must play. He links contemporary crises, such as the pandemic, the climate emergency, and US-China technological rivalry, to a broader argument that we are entering an era ‘after nature’, in which technological systems replace natural and political orders as the framework for power and survival. The book’s strength lies in its breadth and originality. Maçães demonstrates a rare ability to synthesize insights from the humanities, and the social and natural sciences, identifying structural trends that redefine sovereignty and global order. At times, however, his analysis slips into speculation and prescription, advancing normative claims about dematerialized growth, limitless energy, and virtual migration without sufficient empirical support. Nevertheless, the book offers a striking imaginative reflection on how technology is reshaping power, sovereignty, and the very conditions of human life.