This book begins to fill in a 'black hole' in Chinese history with a critical examination of the history of Chinese expansion into and colonization of the southwest. It is the first study that even attempts to place the indigenous Tai peoples at the center of the story, analyzing how they lived before the Chinese state arrived and how they reacted to the Chinese colonial project. Future research on China's frontiers will be measured against it precisely because Giersch presents the Yunnan frontier in its totality. This original contribution advances our conceptual approach to China's frontiers, casting an illuminating light on the fascinating history of the southwest.