In response to foreign merchants’ attempts to expand commerce beyond the south, the Qianlong Emperor issued a decree making Guangzhou (Canton) the only port open to most Western maritime trade, tightening state control over foreign access and transactions.
The James Flint incident (a British trader’s petitioning effort outside approved channels) heightened Qing concerns about foreign encroachment and helped drive stricter enforcement of the single-port system and limits on foreigners’ movement and contacts with officials.
Hong merchants in Guangzhou were organized into the gonghang (Cohong) as an officially sanctioned intermediary body, operating under the Guangzhou maritime customs supervisor (Hoppo). The Cohong systemized guarantees for duties, behavior, and dispute-handling for foreign ships and traders.
Under the Canton System, most Western merchants were restricted to reside and trade only in the Thirteen Factories district along the Pearl River outside Guangzhou’s city wall, reinforcing a tightly bounded, supervised foreign commercial enclave.
Qing regulations under the Canton System imposed detailed constraints on foreigners’ presence and conduct—limiting residence to the trading season and restricting movement—while maintaining trade via approved Chinese intermediaries.
Britain’s Macartney Embassy pressed for additional ports, a permanent diplomatic presence, and reduced restrictions on British merchants at Guangzhou; the Qianlong Emperor rejected these requests, underscoring Qing commitment to the existing trade framework.
With opium already a growing commodity in the China trade, Qing prohibitions (and subsequent enforcement drives) pushed the business further into smuggling networks, worsening tensions around the regulated Guangzhou trade environment.
Imperial Commissioner Lin Zexu was dispatched to Guangdong to halt the opium trade; his campaign targeted dealers and pressured the Cohong and foreign merchants in the Guangzhou foreign enclave to surrender opium stocks.
Beginning 1839-06-03, Lin oversaw the destruction of seized opium at Humen over 23 days. The action became a central trigger for the First Opium War, linking trade regulation disputes to armed conflict.
The Treaty of Nanking ended the First Opium War and restructured foreign trade: Britain gained Hong Kong, an indemnity, and access beyond Guangzhou through newly opened treaty ports, undercutting the single-port framework central to the Canton System.
Treaty provisions explicitly ended the requirement that British merchants deal exclusively with Hong merchants (Cohong), eliminating the licensed intermediary monopoly that had been foundational to Canton System governance of foreign trade.
The treaty authorized British merchants to trade at five treaty ports (including Guangzhou plus additional ports such as Xiamen, Fuzhou, Ningbo, and Shanghai) and to transact more freely, marking the effective end of the Canton System’s one-port restriction.
Canton System and Qing Maritime Trade Regulation (1757–1842)
