History › Age of revolutions › New Imperialism: European empires at their peak
Opium Wars
1839–1842 and 1856–1860· War· Asia
Well documentedSolid records, physical evidence or scientific consensus.
Two wars in which Britain, joined by France in the second, defeated Qing China and forced it open to foreign trade, including opium.
See it on the History map →What happened
Britain bought vast amounts of Chinese tea but had little China wanted, so opium grown in British India was smuggled into China and paid for in silver. By the 1830s millions of Chinese used it. In 1839 Commissioner Lin Zexu destroyed about 1,200 tonnes of seized opium at Canton. Britain sent gunboats, won, and the 1842 Treaty of Nanjing ceded Hong Kong and opened five ports. A second war ended with British and French troops looting and burning Beijing's Summer Palace in 1860.
Why it matters
The defeats exposed Qing weakness and began a run of 'unequal treaties' forced on Asian nations. China counts them as the start of its 'century of humiliation.'
How we know
British parliamentary debates, where a young William Gladstone denounced the war, Lin Zexu's letter to Queen Victoria, the treaty texts, and Qing court and trade records.
Still debated
Was it a war about opium, or about free trade and diplomatic equality? British and Chinese historians weigh the motives differently, and addiction numbers are rough estimates.
Connections (5)
▸East India Companies: the first great corporations supplied the opium behind Opium WarsWell documented
The connection
The British East India Company held a monopoly on opium grown in Bengal and auctioned it in Calcutta to private traders, who smuggled it into China. Silver from those sales paid for the tea Britain craved. When China cracked down in 1839, traders and their allies pressed London for war.
When and how
Poppy fields of Bengal and Bihar, Calcutta auctions and the Canton coast, about 1773 to 1839; firms like Jardine Matheson ran the shipping.
How we know
Company revenue records show opium as a major income source; Chinese records document the silver flowing out; traders' letters show them lobbying Foreign Secretary Palmerston for war.
Debates and open questions
How much the war was driven by opium profits, versus broader British demands for free trade and diplomatic equality, is still argued.
▸Qing dynasty lost the Opium WarsWell documented
The connection
The Qing court, which saw China as the center of civilization, confined Western trade to Canton and banned opium. When it enforced the ban in 1839, Britain's steam gunboats and modern guns overwhelmed outdated Qing forces. Defeats in 1842 and 1860 forced open ports, ceded Hong Kong and, by treaty in 1858, legalized opium.
When and how
Canton (Guangzhou), the coast and the Yangtze, 1839 to 1842; then Canton, Tianjin and Beijing, 1856 to 1860, under Emperors Daoguang and Xianfeng.
How we know
The texts of the treaties of Nanjing (1842), Tianjin (1858) and Beijing (1860), Qing officials' reports to the throne, and British military dispatches.
Debates and open questions
Why the Qing failed to adapt faster is debated: court politics, a huge empire facing internal revolts, or underestimating the West.
▸Opium Wars were an early example of New Imperialism: European empires at their peakMostly agreed
The connection
Britain fought China in 1839–42, and with France in 1856–60, to force open trade, including in opium grown in British India. Steam gunboats easily beat Chinese forces. The resulting 'unequal treaties' gave Britain Hong Kong and foreigners special rights. Using industrial force to impose trade foreshadowed the empire-building after 1870.
When and how
Chinese coasts and rivers from Canton (Guangzhou) to Beijing; the Treaty of Nanjing (1842), the Treaty of Tianjin (1858), and the burning of Beijing's Summer Palace in 1860.
How sure are we?
British parliamentary debates, the treaty texts, and Chinese records such as Commissioner Lin Zexu's 1839 letter to Queen Victoria.
Debates and open questions
Because the Opium Wars predate 1870, some historians class them as 'free-trade imperialism', a different phase from the later rush for territorial colonies.
▸Opium Wars began China's 'century of humiliation' before the Chinese Communist RevolutionDebated
The connection
Britain's victories in the Opium Wars forced China to open ports, cede Hong Kong and accept 'unequal treaties'. Defeats by France, Japan and others followed. The Communist Party built its story around ending this 'century of humiliation', 1839 to 1949, and presented its 1949 victory as the moment China 'stood up'.
When and how
First Opium War 1839–42 and the Treaty of Nanjing, 1842; 'national humiliation' became a rallying cry from 1915, used by Nationalists and later Communists.
How sure are we?
The wars and treaties are well documented. The link is debated because the 'century of humiliation' is partly a political narrative built later by both parties.
Debates and open questions
Historians debate how much foreign pressure, versus internal problems like population growth, rebellion and weak government, caused the Qing decline.
▸Opium Wars weakened the Qing, helping to spark the Taiping RebellionMostly agreed
The connection
Defeat in the First Opium War damaged the Qing's prestige and finances. As foreign trade shifted from Canton to Shanghai, many porters and boatmen in the south lost work, and bandits and secret societies spread. Hong Xiuquan studied with an American missionary in Canton in 1847, then found eager recruits among the discontented in Guangxi.
When and how
Guangdong and Guangxi provinces, 1842 to 1851; Hong studied with Baptist missionary Issachar Roberts in 1847; the uprising was proclaimed at Jintian in January 1851.
How sure are we?
Qing reports on southern unrest, Taiping writings and Roberts's accounts; the link is indirect, inferred from timing and economic records.
Debates and open questions
Population pressure, famine and feuds between Hakka migrants and local Punti may matter more than the war; historians weigh these causes differently.