AI overview
1803 was a year in the early 19th century that marked significant historical events, most notably the Louisiana Purchase in which the United States acquired vast territory from France. This transaction doubled the size of the United States and is considered one of the most important land deals in American history, opening the way for westward expansion.
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December 20: U.S. increases in size with Louisiana purchase
January 5: steamboat Charlotte Dundas is demonstrated. September 23: Battle of Assaye Completing the Louisiana Purchase from France .