Centuries: 18th century - 19th century - 20th century
Decades: 1750s 1760s 1770s 1780s 1790s - 1800s - 1810s 1820s 1830s 1840s 1850s
Years: 1798 1799 1800 1801 1802 - 1803 - 1804 1805 1806 1807 1808
- William Osgoode[?], Chief Justice of Lower Canada, ruled that slavery was inconsistent with British Law.
- January 30 - Monroe and Livingston sail for Paris to discuss, and possibly buy, New Orleans. They end completing the Lousiana Purchase.
- February 24 - The Supreme Court of the United States, in Marbury v. Madison, establishes the principle of judicial review.
- March 1 - Ohio is admitted as the 17th U.S. state.
- April 30 - Louisiana Purchase made by the United States from France.
- May 18 - The United Kingdom declares war on France after France refused to withdraw from Dutch territory.
- July 4 - The Louisiana Purchase is announced to the American people.
- July 5 - The convention of Artlenburg[?] leads to the French occupation of Hanover (which had been ruled by the British king).
- July 26 - The wagonway between Wandsworth and Croydon is opened, being the first public railway line of the world.
- September 23 - British troops defeat an Indian army in the Battle of Assaye[?]
- Argovia, Grisons, St. Gallen[?], Thurgau[?], the Ticino, Vaud[?] become Swiss cantons.
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