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| 1803 |
| | | The Frankfurt banker Mayer Amschel Rothschild lends 20 million francs to the Danish government | |
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| 1803 |
| | | The peace of Amiens comes to an abrupt end when Britain declares war again on France | |
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| 1803 |
| | | In Marbury v. Madison, a landmark example of judicial review, the US Supreme Court declares an act of Congress to be unconstitutional | |
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| 1803 |
| | | Napoleon assembles an invasion fleet against Britain, where Martello towers are hastily built in preparation | |
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| c. 1803 |
| | | James Brewer doubles the site and establishes the Star and Garter as a major hotel | |
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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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