What territory did the United States buy from France in 1803?

The LOUISIANA TERRITORY (Louisiana Purchase) was purchased from France in 1803 for approximately $15 million — one of the largest land deals in history. President Thomas Jefferson negotiated the purchase, which doubled the size of the United States, adding approximately 828,000 square miles of land west of the Mississippi River. The Louisiana Territory stretched from the Mississippi River to the Rocky Mountains and from the Gulf of Mexico to the Canadian border. It eventually became all or part of 15 present-day U.S. states: Louisiana, Missouri, Arkansas, Iowa, North Dakota, South Dakota, Nebraska, Kansas, Oklahoma, Colorado, Wyoming, Montana, Minnesota, New Mexico, and Texas. Why did France sell? Napoleon Bonaparte had planned a New World empire but faced a successful slave revolt in Haiti (the Haitian Revolution led by Toussaint Louverture) and the prospect of renewed war with Britain — he needed money and couldn't defend distant American territories. Jefferson and James Monroe negotiated the deal quickly. The Lewis and Clark Expedition (1804-1806) was commissioned to explore and map the new territory — Meriwether Lewis and William Clark led the Corps of Discovery from St. Louis to the Pacific Ocean and back. The Louisiana Purchase greatly expanded America's agricultural land and later contributed to the concept of 'Manifest Destiny' — the 19th-century belief that the US was destined to expand westward across the continent.