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| 1803 |
| | | Napoleon assembles an invasion fleet against Britain, where Martello towers are hastily built in preparation | |
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| 1803 |
| | | The uprising by Irish nationalist Robert Emmet ends in disaster when he marches on Dublin with only about 100 men | |
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| 1803 |
| | | In the Louisiana Purchase, Jefferson buys from Napoleon nearly a million square miles at a knock-down price, doubling the size of the USA | |
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| 1803 |
| | | English chemist John Dalton reads a paper describing his Law of Partial Pressure in gases (discovered in 1801) | |
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| 1803 |
| | | At the end of his Partial Pressure paper, John Dalton makes brief mention of his radical theory of differing atomic weights | |
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| 1803 |
| | | The USS Philadelphia is captured, with its 300 crew, in the first Barbary War between the US and north African pirate states | |
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| 1804 |
| | | The independence of Haiti from France is proclaimed by a new black ruler calling himself the emperor Jacques I | |
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| 1804 |
| | | Napoleon sends an ill-judged message to royalist opponents when he orders the seizure and execution of the young duke of Enghien | |
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| 1804 |
| | | Richard Trevithick runs the first locomotive on rails, pulling heavy weights a distance of 9 miiles (15 km) near Merthyr Tydfil in Wales | |
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| 1804 |
| | | Meriwether Lewis and William Clark set off from St Louis to explore up the Missouri river and west to the coast | |
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