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1803
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| 1803 | | The Louisiana Purchase Took Place |
In which a vast section of territory in the US west of the Mississippi was purchased from France's territorial claims
| 1803 | | Louisiana Purchase |
United States buys Louisiana from France.
| 1803 | | Treaty of Surji-Arjungaon |
Between the British and Daulat Rao Sindhia, chief of the Maratha people; treaty was revised twice.
| Napoleonic Wars | | 1803-1815 |