Which States Were Part of the Louisiana Purchase and How Much Land Did It Add To the United States?

Louisiana, Missouri, Arkansas, Iowa, North Dakota, South Dakota, Nebraska, and Oklahoma were wholly contained in the Louisiana Purchase.

In addition, most of the land in Kansas, Colorado, Wyoming, Montana, and Minnesota was part of the Louisiana Purchase.

The French territory of Louisiana stretched northwest from the present state of Louisiana all the way to the Canadian border.

The Louisiana Purchase added 828,000 square miles (2.1 million sq km) to the United States in 1803, doubling its size.