In 1803, the United States acquired from France the region of Louisiana. Uneasy at news that Spain had secretly retroceded Louisiana to a Napoleonic France, President Jefferson, in 1802, dispatched Robert R. Livingston and James Monroe to purchase New Orleans and West Florida for two million dollars. Since Louisiana was of diminishing importance to France, that country offered to sell the entire territory to the surprised envoys for fifteen million dollars. The treaty of cession was dated April 30, 1803, and the U.S. flag was raised over New Orleans on December 20, 1803.
From the description of Charles Lynch letters : 1799-1804. (Kentucky Historical Society). WorldCat record id: 36707741