China’s relations with the Asian world between 1500 and 1900 were shaped by a variety of political, economic, and cultural factors. A common denominator in these international relationships was a loose framework of ideological principles and administrative procedures later dubbed by scholars the “tributary system.” This “system,” first posited in the early 1940s, has remained the single most influential concept for interpreting the interactions of Ming and Qing China with Asian countries. However, in recent decades it has been critiqued from various perspectives, narrowed in the scope of its application, and modified by a greater focus on the actual course of specific cases rather than ideological principles. That is, historians have increasingly come to understand China’s relations with the Asian world as influenced by pragmatic considerations and changing local dynamics, so that each relationship and the factors shaping it are best understood on their own terms. One approach to the study of Ming and Qing relations with the Asian world is to consider it within the framework of three regional groupings. China’s interactions with its neighbors in Northeast Asia were shaped by its largely stable relations with Korea and the Ryukyu Kingdom, and its radically fluctuating relations with Japan, sometimes marked by conflict and sometimes by the deliberate avoidance of political contact. Early Ming political relations with maritime Southeast Asia atrophied as the role of European and private Chinese merchant intermediaries increased. Those with continental Southeast Asia (particularly Burma, Siam, and Vietnam), more enduring, were influenced by intense regional rivalries that occasionally impinged on the borderlands of China’s southern provinces. In these two regions, the Ming–Qing transition, although particularly resented in Korea where it involved two invasions, did not radically alter existing patterns of international relations. By contrast, the vast territorial expansion of the Qing Empire did greatly change China’s foreign relations to the north and west, where it encountered states that had not had relations with the Ming. In these regions the Qing government drew principles and practices from its foreign relations in the south and east, but modified them to fit new conditions. After 1800, and more intensively after 1850, European and later Japanese imperial power began to penetrate Central, South, Southeast, and ultimately East Asia, in each region undermining existing Qing relationships with Asian neighbors. By 1900, virtually all former Qing tributaries were under the direct or indirect control of the British, Russian, French, or Japanese empires.