This book examines the ongoing power transition and its ramifications for world order from an international society perspective. In that perspective, the outcome of big changes in the distribution of power is a matter of socialization rather than structural determination or the resilience of the so-called Liberal world order. Consequently, the key question of this book is how the ongoing power transition affects, and is affected by, the social institutions of world order including sovereignty, the balance of power, international law, diplomacy, trade, humanitarian intervention, national self-determination, and environmental stewardship.