Abstract
During the seventeenth century, an alliance took shape between Japan's Tokugawa bakufu and the Zheng organization of southeastern China and Taiwan. The Zheng, especially under the half-Japanese Koxinga in the 1650s, were ideal partners because of their domination of maritime East Asian trade, privileged access to much-coveted Chinese goods, and commitment to Ming restoration against the Manchu Qing, a popular stance in Japan. The organization jointly administered the Chinese community at Nagasaki with the bakufu, and received aid in Japanese armaments and probably mercenaries. Starting in the 1660s, the alliance unraveled amid the depletion of silver to purchase Chinese goods, the rise of a robust domestic market in Japan, and the destruction of the Zheng by the Qing. This article portrays Japan's isolation policy (sakoku) as a dynamic process, from active involvement overseas to withdrawal, based upon rational assessments of the international climate and subject to contestation from local and foreign players.