1840s

The 1840s decade ran from January 1, 1840, to December 31, 1849.

Politics and wars

Pacific Islands

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.

East Asia

China

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.

Other events:

1840s in sociology

The following events related to sociology occurred in the 1840s.

1840

1842

1843

1844

1845

1846

1847

Mormonism in the 19th century

This is a chronology of Mormonism. In the late 1820s, founder Joseph Smith, founder of the Latter Day Saint movement, announced that an angel had given him a set of golden plates engraved with a chronicle of ancient American peoples, which he had a unique gift to translate. In 1830, he published the resulting narratives as the Book of Mormon and founded the Church of Christ in western New York, claiming it to be a restoration of early Christianity.

Moving the church to Kirtland, Ohio in 1831, Joseph Smith attracted hundreds of converts, who were called Latter Day Saints. He sent some to Jackson County, Missouri to establish a city of Zion. In 1833, Missouri settlers expelled the Saints from Zion, and Smith's paramilitary expedition to recover the land was unsuccessful. Fleeing an arrest warrant in the aftermath of a Kirtland financial crisis, Smith joined his remaining followers in Far West, Missouri, but tensions escalated into violent conflicts with the old Missouri settlers. Believing the Saints to be in insurrection, the Missouri governor ordered their expulsion from Missouri, and Smith was imprisoned on capital charges.