- a treaty signed with France in 1803 by which the U.S. purchased for $15,000,000 the land extending from the Mississippi River to the Rocky Mountains and from Canada to the Gulf of Mexico.
- the land included in this purchase.
- the large region of North America sold by Napoleon I to the US in 1803 for 15 million dollars: consists of the W part of the Mississippi basin. Area: about 2 292 150 sq km (885 000 sq miles)
