The United States bought the Louisiana Territory from France in 1803.
Known as the Louisiana Purchase, this deal dramatically expanded U.S. land holdings westward.

Quick Facts

  • Date Signed : April 30, 1803, by U.S. negotiators Robert Livingston and James Monroe.
  • Size : About 828,000 square miles—roughly doubling the nation's territory at a steal of 3-4 cents per acre.
  • Price : $15 million, though U.S. envoys were originally authorized only for New Orleans up to $10 million.

What Land Was It?

The territory stretched from the Mississippi River to the Rocky Mountains, and from the Gulf of Mexico to Canada (British territory then).
It covered land that later became all or part of 15 states, including Louisiana, Arkansas, Missouri, Iowa, Oklahoma, Kansas, Nebraska, and parts of Minnesota, North Dakota, South Dakota, New Mexico, Texas, Montana, Wyoming, and Colorado.

France had regained it from Spain in 1800, but Napoleon sold it amid wars and financial needs.

Why It Happened

President Thomas Jefferson sought New Orleans for Mississippi River trade access.
Napoleon, facing war with Britain and Haitian revolts, offered the whole territory—stunning the Americans who snapped it up.

This "bargain of the century" fueled westward expansion, like the Lewis and Clark expedition.

Lasting Impact

It boosted U.S. power, confirmed federal "implied powers," and shifted Native American lands, sparking debates on constitutionality.

TL;DR : Louisiana Territory—828,000 sq mi for $15M, signed 1803, reshaped America.

Information gathered from public forums or data available on the internet and portrayed here.