1800–1809

Millennium:	2nd millennium
Centuries:	18th century - 19th century - 20th century
Decades:	1770s 1780s 1790s - 1800s - 1810s 1820s 1830s
Years:	1800 1801 1802 1803 1804 1805 1806 1807 1808 1809
Categories:	Births - Deaths - Architecture Establishments - Disestablishments

[edit] Events and trends

Invention of the Jacquard loom in 1801.
Ultraviolet radiation is discovered by Johann Wilhelm Ritter in 1801.
Flag semaphore is gradually adopted by various navies of the world.
Morphine is isolated from opium for the first time in 1804.
Nicolas François Appert develops a method to preserve food by means of canning in 1809.
John Dalton publishes his atomic theory 1803.

The first known asteroids are discovered in this decade:
- Ceres (1801-01-02). Ceres is reclassified as a dwarf planet in 2006.
- Pallas (1802-03-28)
- Juno (1804-09-01)
- Vesta (1807-03-29)

End of the Quasi-War (1800).
The First Barbary War (1801–1805) is fought between the United States and the Barbary States of North Africa.
The Kingdom of Great Britain and the Kingdom of Ireland merge into the United Kingdom of Great Britain and Ireland in 1801.
In 1803, the US acquired the Louisiana Territories from France.
The Second Anglo-Maratha War (1803-1805) is fought between the Maratha Peshwa on one side and minor chieftains of the Maratha Confederacy Sindhia,Bhonsle and Holkar on the other resulting in a crushing defeat of the rebel chieftains and the breakup of the Maratha confederacy.
Haiti gains independence from France on 1804-01-01, becoming the first black republic.
The Fulani War (1804–1810) is fought in present day Nigeria and Cameroon.
The First Serbian Uprising (1804−1813) marks the first time in 300 years Serbia perceives itself an independent state.
End of the French Revolutionary Wars (1792-1802).
Beginning of the Napoleonic Wars (1803–1815).
Beginning of the Russo-Turkish War (1806–1812) between Russia and the Ottoman Empire.