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1840s

Millennium: 2nd millennium
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The 1840s decade ran from January 1, 1840, to December 31, 1849.

In 1842, Tahiti and Tahuata were declared a French protectorate, to allow Catholic missionaries to work undisturbed. The capital of Papeetē was founded in 1843. In 1845, George Tupou I united Tonga into a kingdom, and reigned as Tuʻi Kanokupolu.

On August 29, 1842, the first of two Opium Wars ended between China and Britain with the Treaty of Nanking. One of the consequences was the cession of modern-day Hong Kong Island to the British. Hong Kong would eventually be returned to China in 1997.

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The 1840s comprised the end of the Tenpō era (1830-1844), the entirety of the Kōka era (1844-1848), and the beginning of the Kaei era (1848-1854). The decade saw the end of the reign of Emperor Ninko in 1846, who was succeeded by his son, Emperor Kōmei.

Emperors Minh Mạng, Thiệu Trị and Tự Đức ruled Vietnam during the 1840s under the Nguyễn dynasty.

The First Anglo-Afghan War had started in 1838, started by the British as a means of defending India (under British control at the time) from the Russian Empire's expansion into Central Asia. The British attempted to impose a puppet regime on Afghanistan under Shuja Shah, but the regime was short lived and proved unsustainable without British military support. By 1842, mobs were attacking the British on the streets of Kabul and the British garrison was forced to abandon the city due to constant civilian attacks. During the retreat from Kabul, the British army of approximately 4,500 troops (of which only 690 were European) and 12,000 camp followers was subjected to a series of attacks by Afghan warriors. All of the British soldiers were killed except for one and he and a few surviving Indian soldiers made it to the fort at Jalalabad shortly after. After the Battle of Kabul (1842), Britain placed Dost Mohammad Khan back into power (1842-1863) and withdrew from Afghanistan.


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