1800s
| 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 | |
Events and Trends
- Beginning of the Napoleonic Wars (1803 - 1815).
- Semaphore is adopted by navies.
- United Kingdom founded in 1801
World Leaders
- Emperor Napoleon I (France)
- Emperor Francis II (Holy Roman Empire)
- Pope Pius VII
- Emperor Alexander I (Russia)
- King George III, (United Kingdom)
- President John Adams (United States)
- President Thomas Jefferson (United States)