Causes: tea, silver and opium
By the 1700s British people loved tea, and tea came from China. The Qing government let foreigners trade only at the port of Guangzhou (Canton), through a small group of licensed Chinese merchants called the Cohong. China sold tea, silk and porcelain and wanted little in return except silver. So silver flowed into China and Britain worried about running out.
The opium answer
British traders found something China's people would buy: opium, a strong drug grown in India. It was smuggled into China. From about 4,000 chests a year around 1800, imports rose to about 40,000 chests by the late 1830s (rounded figures). Many people became addicted, families and soldiers were harmed, and silver now flowed out of China to pay for opium. Silver was needed to pay taxes, so farmers felt the pinch.
The Qing government banned opium several times, but corrupt officials and rich smugglers kept the trade alive.
The First Opium War (1839-1842): course of the war
In 1839 the emperor sent the official Lin Zexu to Guangzhou. He ordered foreign traders to hand over their opium and destroyed thousands of chests at Humen. Britain called this a seizure of its merchants' property, and sent a naval force. Both sides gave reasons: the Qing said it had the right to ban a harmful drug on its own soil; Britain said it wanted free trade and payment for goods destroyed.
The war lasted from 1839 to 1842. Britain had steam-powered gunboats and modern guns. They beat the Qing defences at ports along the coast and moved up the Yangtze river. The Qing could not answer these forces and had to ask for peace.
The Treaty of Nanjing (1842)
The war ended with the Treaty of Nanjing, signed in August 1842. Main terms:
- Hong Kong island was handed over to Britain.
- Five ports opened to foreign trade and residents: Guangzhou, Xiamen, Fuzhou, Ningbo, Shanghai.
- China paid a large indemnity of 21 million silver dollars (for the destroyed opium, merchants' debts and war costs).
- The Cohong monopoly ended, so trade was no longer limited to a few merchants.
- Import duties were fixed at a low level, which China could not change alone.
Treaties in the following year added that foreigners would be tried by their own officials, not by Chinese courts (extraterritoriality), and that any right given to one power would go to others too. Other countries, such as the USA and France, signed similar treaties soon after.
The beginning of semi-colonial status
China was not made into a full colony. Its emperor and government stayed. But it lost control of some basic powers: setting its own tariffs, trying foreigners in its own courts, and deciding which ports to open. A country that is formally independent but whose key powers are held in part by foreign powers is called semi-colonial. Historians also call the old social system that continued inside China semi-feudal: big landlords, tenant farmers and old customs stayed. Together the phrase is "semi-colonial and semi-feudal", which is the way many Chinese textbooks describe this period.
The Second Opium War (1856-1860) and the unequal treaties
After 1842 Britain and France were not satisfied. They wanted more ports, an envoy in Beijing, travel inland and a legal opium trade. In 1856 Chinese officials boarded a ship called the Arrow at Guangzhou; Britain called this an insult and used it as a reason to fight. France joined, using the killing of a French missionary as its reason.
- 1858, Treaties of Tianjin: more ports opened, foreign envoys allowed, travel inland and on the Yangtze allowed, opium trade made legal, missionaries given protection.
- Fighting started again when the treaties were not carried out. In 1860 British and French troops reached Beijing. They looted and burned the Old Summer Palace (Yuanmingyuan), a great imperial garden full of art, books and buildings.
- Convention of Beijing (1860): China accepted the treaties, gave the Kowloon peninsula to Britain, opened Tianjin, and paid more money.
Why "unequal treaties"?
They were signed after defeat, gave rights to foreigners that China did not receive in return, and limited China's control over its own trade and courts. The name "unequal treaties" is used for them.
Try it
In the 3D free-play step, slide the timeline slowly and copy each event onto a line of paper. Then draw arrows between events to make a cause-and-effect chain, for example: more opium → silver drains → Lin Zexu's ban → war → treaty. Compare your chain with a friend's. Do you agree on which cause mattered most?
Key formulas and definitions
- Timeline: 1839 ban → 1839-42 First Opium War → 1842 Treaty of Nanjing → 1856-60 Second Opium War → 1858 Tianjin → 1860 Beijing
- Cause chain: tea trade → silver in → opium sold → silver out and addiction → ban → war
- Treaty of Nanjing = Hong Kong island + 5 ports + 21 million silver dollars + end of Cohong monopoly + fixed tariffs
- Semi-colonial = formally independent, but key powers (tariffs, courts, ports) held in part by foreign powers
- Five ports: Guangzhou, Xiamen, Fuzhou, Ningbo, Shanghai
Worked examples
1. About 4,000 chests of opium entered China in 1800 and about 40,000 in the late 1830s. By how many times did the trade grow?
40,000 ÷ 4,000 = 10 times. This sharp rise helps explain the silver drain and the harm.
2. The indemnity of 21 million silver dollars was made of 6 million for opium, 3 million for merchants' debts and the rest for war costs. How much was for war costs?
21 − 6 − 3 = 12 million silver dollars.
3. How many years did the First Opium War last, and how many years passed between the Treaty of Nanjing and the Tianjin treaties?
The war ran from 1839 to 1842, about 3 years. Nanjing (1842) to Tianjin (1858) is 16 years.
4. Name the five treaty ports of 1842 and say what a "treaty port" is.
Guangzhou, Xiamen, Fuzhou, Ningbo and Shanghai. A treaty port is a port opened by treaty to foreign trade and foreign residents.
5. Why is the Old Summer Palace remembered so strongly in China?
It was an imperial garden of great buildings, art and books. Its looting and burning in 1860 destroyed a treasure that cannot be replaced, and it became a symbol of loss and national shame in the memory of the period.
6. Why can both sides' views be explained in the First Opium War?
The Qing view: a country may ban a harmful drug on its own land. The British view of the time: they wanted open trade and payment for destroyed goods. Most historians today say the opium trade itself was harmful and that the war forced unequal terms on China.
Common mistakes
- Thinking the wars were only about tea. The key issue was opium and who controlled trade.
- Mixing the dates: First Opium War 1839-42, Second 1856-60.
- Thinking China became a full colony. It stayed formally independent but lost control of tariffs, courts and ports (semi-colonial).
- Forgetting that the Cohong monopoly ended and that tariffs were fixed in the Treaty of Nanjing.