Qing China and Britain signed the Treaty of Nanjing, ending the First Opium War and establishing the foundational “treaty port” framework by opening five ports to foreign residence and trade and ceding Hong Kong Island to Britain.
The Sino-British supplementary Treaty of the Bogue codified key unequal-trade mechanisms, notably British extraterritoriality and a most-favoured-nation clause that helped generalize concessions across later treaties.
The United States’ first treaty with Qing China extended privileges comparable to those Britain had obtained after 1842 and deepened the treaty-port legal regime through expanded extraterritorial provisions.
France concluded the Treaty of Whampoa with Qing China, obtaining treaty-port trading rights and extraterritorial protections on terms broadly aligned with earlier British concessions, reinforcing the multi-power unequal treaty framework.
Foreign-managed maritime customs administration began in 1854, creating a durable institutional mechanism for collecting duties at treaty ports and shaping Qing fiscal capacity under unequal-trade constraints.
A set of treaties signed at Tianjin expanded foreign commercial access by opening additional ports to trade and residence, allowing foreign legations, and further institutionalizing the unequal treaty system (including provisions commonly summarized as effectively legalizing the opium import trade).
Following the Second Opium War, the Convention of Beijing (Peking) ratified and expanded key arrangements associated with the Tianjin treaties, entrenching the treaty-port system and widening foreign rights and access.
Under the post-1860 treaty framework, Britain established a formal concession in Tianjin, exemplifying how treaty-port privileges could develop into semi-autonomous foreign-administered enclaves within key commercial cities.
Britain and Qing China negotiated the Chefoo Convention at Yantai (Chefoo), resulting in additional concessions and the opening of new ports, further extending the treaty-port architecture beyond the original five ports.
After Qing defeat in the First Sino-Japanese War, the Treaty of Shimonoseki imposed a major indemnity and opened additional ports (e.g., Shashi, Chongqing, Suzhou, Hangzhou) to Japanese trade, extending unequal trade regimes to Japan’s benefit.
As concession pressures peaked in the late 1890s, an imperial decree opened additional ports such as Sandu’ao, illustrating how the treaty-port network expanded not only through treaties but also through Qing proclamations made under external pressure.
China and Britain signed the Convention for the Extension of Hong Kong Territory, leasing the New Territories (and New Kowloon) to Britain for 99 years—part of the broader late-19th-century intensification of concession-seeking pressures on the Qing state.
Treaty Port System and Unequal Trade Regimes (1842–1900)
