The Louisiana Purchase (French: Vente de la Louisiane "Sale of Louisiana") was the acquisition by the United States of America of 828,000 square miles (2,140,000 km²) of France's claim to the territory of Louisiana in 1803. The U.S. paid 60 million francs ($11,250,000) plus cancellation of debts worth 18 million francs ($3,750,000), for a total sum of 15 million dollars (less than 3 cents per acre) for the Louisiana territory ($233 million in 2011 dollars, less than 42 cents per acre).

The Louisiana Purchase encompassed all or part of 15 current U.S. states and two Canadian provinces. The land purchased contained all of present-day Arkansas, Missouri, Iowa, Oklahoma, Kansas, and Nebraska; parts of Minnesota that were west of the Mississippi River; most of North Dakota; nearly all of South Dakota; northeastern New Mexico; northern Texas; the portions of Montana, Wyoming, and Colorado east of the Continental Divide; and Louisiana west of the Mississippi River, including the city of New Orleans. Spain originally had all of the Louisiana Purchase but it was known as New Spain, then eventually was given to France from Spain and was officially known as the Louisiana Purchase, and was later given to the United States of America from France to pay war debt and helped doubled the United States as well as create new states.^{[clarification needed]} (Parts of this area were still claimed by Spain at the time of the purchase.)

Louisiana (ⁱ/luːˌiːziˈænə/ or ⁱ/ˌluːziˈænə/; French: État de Louisiane, [lwizjan] ( listen); Louisiana Creole: Léta de la Lwizyàn) is a state located in the southern region of the United States of America. Louisiana is the 31st most extensive and the 25th most populous of the 50 United States. Its capital is Baton Rouge and largest city is New Orleans. Louisiana is the only state in the U.S. with political subdivisions termed parishes, which are local governments equivalent to counties. The largest parish by population is East Baton Rouge Parish, and the largest by land area is Cameron Parish.

Much of the state was formed from sediment washed down the Mississippi River, leaving enormous deltas and vast areas of coastal marsh and swamp. These contain a rich southern biota; typical examples include birds such as ibis and egrets. There are also many species of tree frogs, and fish such as sturgeon and paddlefish. In more elevated areas, fire is a natural process in the landscape, and has produced extensive areas of longleaf pine forest and wet savannas. These support an exceptionally large number of plant species including many species of orchids and carnivorus plants.

Thomas Jefferson (April 13, 1743 (April 2, 1743 O.S.) – July 4, 1826) was an American Founding Father, the principal author of the United States Declaration of Independence (1776) and the third President of the United States (1801–1809). At the beginning of the American Revolution, Jefferson served in the Continental Congress, representing Virginia. He then served as a wartime Governor of Virginia (1779–1781). Just after the war ended, from mid-1784 Jefferson served as a diplomat, stationed in Paris, initially as a commissioner to help negotiate commercial treaties. In May 1785, he became the United States Minister to France. He was the first United States Secretary of State (1790–1793) during the administration of President George Washington. Upon resigning his office, with his close friend James Madison he organized the Democratic-Republican Party. Elected Vice-President in 1796, under his opponent John Adams, Jefferson with Madison secretly wrote the Kentucky and Virginia Resolutions, which attempted to nullify the Alien and Sedition Acts.