It became known as the "Louisiana Purchase" and stretched from the mouth of the Mississippi River to Canada, including what later became the states of Oklahoma, Arkansas, Kansas, Missouri, Iowa, Nebraska, South Dakota, and parts of what became Louisiana, Texas, Colorado, Wyoming, Montana, Minnesota and New Mexico, as well as the provinces of Alberta and Saskatchewan, after additional purchases, cessions and treaties.
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France ,under Napoleon, sold the Louisiana Territory to the US for $15 million in 1803.
The United States bought the Mississippi River Valley, known as Le Louisiane, from France in 1803, in the Louisiana Purchase.President Thomas Jefferson's representatives (Robert Livingston and James Monroe) signed the treaty on April 30, 1803. On July 4, 1803, Jefferson announced the treaty, and it was ratified by the Senate on October 20. New Orleans was transferred to the US on December 20, 1803, and the remainder of the territory on March 1, 1804 at St. Louis.Although of dubious legality on several points, the Purchase codified American claims in North America, and set the stage for further westward expansion.Lower Louisiana was transferred to US control on Dec 20th, 1803. The remainder (Upper Louisians) was handed over three months later.In 1803 the United States bought the Louisiana Territory from France.July 4th, 18051803.
== == Not sure what you are asking. The U.S. Government bought the Louisiana purchase, which Meriweather Lewis and William Clark were well known for exploring. History records where they lived, but I can find no information as to whether they bought land or just inherited it.
The most important foreign-held territory during 1804 was France's hold over a good third of the land. However, in that year they sold it all to America in what's known as the Louisiana Purchase.
The Lewis and Clark expedition did not gain any land for the United States. The expedition was sent to explore land that was recently purchased from France. The area was known as Louisiana territory.