This model monograph is the first scholarly study to put the Ainu--the native people living in Ezo, the northernmost island of the Japanese archipelago--at the center of an exploration of Japanese expansion during the seventeenth and eighteenth centuries, the height of the Tokugawa shogunal era. Inspired by "new Western" historians of the United States, Walker positions Ezo not as Japan's northern "frontier" but as a borderland or middle ground. By...