The Louisiana Territory had been a land purchase transaction by the United States of America of 828,800 square miles of the French territory "Louisiane" in 1803. The U.S. paid 60 million francs ($11,250,000) plus cancellation of debts worth 18 million francs ($3,750,000), a total cost of $15,000,000 for the Louisiana Territory.
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France ,under Napoleon, sold the Louisiana Territory to the US for $15 million in 1803.
The state of Louisiana was once part of the Louisiana Territory. Other states that were once part of the Louisiana Territory are Missouri, Arkansas, Texas, Iowa, Minnesota, Kansas, Nebraska, and Colorado. North Dakota, South Dakota, Wyoming, Oklahoma, New Mexico, and Montana are the other states that were once part of the Louisiana Territory.
... roughly doubled in size
Louisiana Purchase (1803), Florida (1819- US assumed $5 million in claims against Spain in exchange for Florida), Mexican cession (1848- purchased under duress after winning the Mexican War.), Gadsden Purchase (1854), Alaska (1865) and Virgin Islands (1917).
Thomas Jefferson bought the Louisiana Territory.