The Louisiana Purchase (French: Vente de la Louisiane, lit. 'Sale of Louisiana') was the acquisition of the territory of Louisiana by the United States from the French First Republic in 1803. This consisted of most of the land in the Mississippi River's drainage basin west of the river. In return for $15 million, or approximately $18 per square mile ($7/km2), the United States nominally acquired a total of 828,000 sq mi (2,140,000 km2; 530,000,000 acres) of land now in the Central United States. However, France only controlled a small fraction of this area, most of which was inhabited by Native Americans; effectively, for the majority of the area, the United States bought the preemptive right to obtain Indian lands by treaty or by conquest, to the exclusion of other colonial powers.
The Kingdom of France had controlled the Louisiana territory from 1682 until it was ceded to Spain in 1762. In 1800, Napoleon Bonaparte, the First Consul of the French Republic, regained ownership of Louisiana in exchange for territories in Tuscany as part of a broader effort to re-establish a French colonial empire in North America. However, France's failure to suppress a revolt in Saint-Domingue in the Caribbean, coupled with the prospect of renewed warfare with the United Kingdom, prompted Napoleon to consider selling Louisiana to the United States.
Acquisition of Louisiana was a long-term goal of President Thomas Jefferson, who was especially eager to gain control of the crucial Mississippi River port of New Orleans. Jefferson tasked James Monroe and Robert R. Livingston with purchasing New Orleans. Negotiating with French Treasury Minister François Barbé-Marbois, the U.S. representatives quickly agreed to purchase the entire territory of Louisiana after it was offered. Overcoming the opposition of the Federalist Party, Jefferson and Secretary of State James Madison persuaded Congress to ratify and fund the Louisiana Purchase.
The Louisiana Purchase extended United States sovereignty across the Mississippi River, nearly doubling the nominal size of the country. The purchase included land from fifteen present U.S. states and two Canadian provinces, including the entirety of Arkansas, Missouri, Iowa, Oklahoma, Kansas, and Nebraska; large portions of North Dakota and South Dakota; the area of Montana, Wyoming, and Colorado east of the Continental Divide; the portion of Minnesota west of the Mississippi River; the northeastern section of New Mexico; northern portions of Texas; New Orleans and the portions of the present state of Louisiana west of the Mississippi River; and small portions of land within Alberta and Saskatchewan. At the time of the purchase, the territory of Louisiana's non-native population was around 60,000 inhabitants, of whom half were enslaved Africans. The western borders of the purchase were later settled by the 1819 Adams–Onís Treaty with Spain, while the northern borders of the purchase were adjusted by the Treaty of 1818 with the British.
The Louisiana Purchase corresponds, nowadays, to more than 26% of the present area of the contiguous United States, which is 2,959,064.44 square miles (7,663,941.7 km2).
Background
Throughout the second half of the 18th century, the French colony of Louisiana became a pawn for European political intrigue. The colony was the most substantial presence of France's overseas empire, though its population was sparse and largely concentrated in small settlements along the Mississippi River and its tributaries. France ceded the territory to Spain in 1762 in the secret Treaty of Fontainebleau. Following French defeat in the Seven Years' War, Spain gained control of the territory west of the Mississippi, and the British received the territory to the east of the river.
Following the establishment of the United States, the Americans controlled the area east of the Mississippi and north of New Orleans. The main issue for the Americans was free transit of the Mississippi out to sea. As the lands were being gradually settled by American migrants, many Americans, including Jefferson, assumed that the territory would be acquired "piece by piece". The risk of another power taking it from a weakened Spain made a "profound reconsideration" of this policy necessary.
New Orleans was already important for shipping agricultural goods to and from the areas of the United States west of the Appalachian Mountains. Pinckney's Treaty, signed with Spain on October 27, 1795, gave American merchants "right of deposit" in New Orleans, granting them use of the port to store goods for export. The treaty also recognized American rights to navigate the entire Mississippi, which had become vital to the growing trade of the western territories.
In 1798, Spain revoked the treaty allowing American use of New Orleans, greatly upsetting the Americans. In 1801, Spanish Governor Don Juan Manuel de Salcedo took over from the Marquess of Casa Calvo, and restored the American right to deposit goods. However, in 1800, Spain had ceded the Louisiana territory back to France as part of Napoleon's secret Third Treaty of San Ildefonso. The subsequent 1801 Treaty of Aranjuez established that Spain's cession of Louisiana was a "restoration" of the territory to France, not a retrocession. The territory nominally remained under Spanish control, until a transfer of power to France on November 30, 1803, just three weeks before the formal cession of the territory to the United States on December 20, 1803.
Negotiation
While the treaty between Spain and France went largely unnoticed in 1800, fear of an eventual French invasion spread across America when, in 1801, Napoleon sent a military force to nearby Saint-Domingue. Though Jefferson urged moderation, Federalists sought to use this against Jefferson and called for hostilities against France. Undercutting them, Jefferson threatened an alliance with Britain, although relations were uneasy in that direction. In 1801, Jefferson supported France in its plan to take back Saint-Domingue (present-day Haiti), which was then under control of Toussaint Louverture after a slave rebellion. However, there was a growing concern in the U.S. that Napoleon would send troops to New Orleans after quelling the rebellion. In hopes of securing control of the mouth of the Mississippi, Jefferson sent Livingston to Paris in 1801 with the authorization to purchase New Orleans.
In December 1801, France sent General Charles Leclerc, Napoleon's brother-in-law, on an expedition to Saint-Domingue to reassert French control over the colony, which had become essentially autonomous under Louverture. Louverture, as a French general, had fended off incursions from other European powers, but had also begun to consolidate power for himself on the island. Before the revolution, France had derived enormous wealth from Saint-Domingue at the cost of the lives and freedom of the enslaved. Napoleon wanted the territory's revenues and productivity for France restored. Alarmed over the French actions and its intention to re-establish an empire in North America, Jefferson declared neutrality in relation to the Caribbean, refusing credit and other assistance to the French, but allowing war contraband to get through to the rebels to prevent France from regaining a foothold.
In 1803, Pierre Samuel du Pont de Nemours, a French nobleman, began to help negotiate with France at the request of Jefferson. Du Pont was living in the United States at the time and had close ties to Jefferson as well as the prominent politicians in France. He engaged in back-channel diplomacy with Napoleon on Jefferson's behalf during a visit to France and introduced the idea of the much larger Louisiana Purchase as a way to defuse potential conflict between the United States and Napoleon over North America.
Throughout this time, Jefferson had up-to-date intelligence on Napoleon's military activities and intentions in North America. Part of his evolving strategy involved giving du Pont some information that was withheld from Livingston. Intent on avoiding possible war with France, Jefferson sent James Monroe to Paris in 1803 to negotiate a settlement, with instructions to go to London to negotiate an alliance if the talks in Paris failed. Spain procrastinated until late 1802 in executing the treaty to transfer Louisiana to France, which allowed American hostility to build. Also, Spain's refusal to cede Florida to France meant that Louisiana would be indefensible.
Napoleon needed peace with Britain to take possession of Louisiana. Otherwise, Louisiana would be an easy prey for a potential invasion from Britain or the U.S. But in early 1803, continuing war between France and Britain seemed unavoidable. On March 11, 1803, Napoleon began planning an invasion of Great Britain.
In Saint-Domingue, Leclerc's forces took Louverture prisoner, but their expedition soon faltered in the face of fierce resistance and disease. By early 1803, Napoleon decided to abandon his plans to rebuild France's New World empire. Without sufficient revenues from sugar colonies in the Caribbean, Louisiana had little value to him. Spain had not yet completed the transfer of Louisiana to France, and war between France and the UK was imminent. Out of anger towards Spain and the unique opportunity to sell something that was useless and not truly his yet, Napoleon decided to sell the entire territory.
Although the foreign minister Talleyrand opposed the plan, on April 10, 1803, Napoleon told the Treasury Minister François Barbé-Marbois that he was considering selling the Louisiana Territory to the United States. On April 11, 1803, just days before Monroe's arrival, Barbé-Marbois offered Livingston all of Louisiana for $15 million, which averages to less than three cents per acre (7¢/ha). The total of $15 million is equivalent to about $391 million in 2025 dollars, or 74 cents per acre. The American representatives were prepared to pay up to $10 million for New Orleans and its environs but were dumbfounded when the vastly larger territory was offered for $15 million. Jefferson had authorized Livingston only to purchase New Orleans. However, Livingston was certain that the United States would accept the offer.
The Americans thought that Napoleon might withdraw the offer at any time, preventing the United States from acquiring New Orleans, so they agreed and signed the Louisiana Purchase Treaty on April 30, 1803 (10 Floréal XI in the French Republican calendar) at the Hôtel Tubeuf in Paris. The signers were Robert Livingston, James Monroe, and François Barbé-Marbois. After the signing Livingston famously stated, "We have lived long, but this is the noblest work of our whole lives ... From this day the United States take their place among the powers of the first rank." On July 4, 1803, the treaty was announced, but the documents did not arrive in Washington, D.C. until July 14. The Louisiana Territory was vast, stretching from the Gulf of Mexico in the south to Rupert's Land in the north, and from the Mississippi River in the east to the Rocky Mountains in the west. Acquiring the territory nearly doubled the size of the United States.
In November 1803, France withdrew its 7,000 surviving troops from Saint-Domingue (more than two-thirds of its troops died there) and gave up its ambitions in the Western Hemisphere. In 1804, Haiti declared its independence; but fearing a slave revolt at home, Jefferson and the rest of Congress refused to recognize the new republic, the second in the Western Hemisphere, and imposed a trade embargo against it. This, together with the successful French demand for an indemnity of 150 million francs in 1825, severely hampered Haiti's ability to repair its economy after decades of war.
Domestic opposition and constitutionality
After Monroe and Livingston had returned from France with news of the purchase, an official announcement of the purchase was made on July 4, 1803. This gave Jefferson and his cabinet until October, when the treaty had to be ratified, to discuss the constitutionality of the purchase. Jefferson considered a constitutional amendment to justify the purchase; however, his cabinet convinced him otherwise. Jefferson justified the purchase by rationalizing, "it is the case of a guardian, investing the money of his ward in purchasing an important adjacent territory; & saying to him when of age, I did this for your good." Jefferson ultimately came to the conclusion before the ratification of the treaty that the purchase was to protect the citizens of the United States therefore making it constitutional.
Henry Adams and other historians have argued that Jefferson acted hypocritically with the Louisiana Purchase, because of his position as a strict constructionist regarding the Constitution, by stretching the intent of that document to justify his purchase. The American purchase of the Louisiana territory was not accomplished without domestic opposition. Jefferson's philosophical consistency was in question and many people believed he and others, including James Madison, were doing something they surely would have argued against with Alexander Hamilton. The Federalists strongly opposed the purchase, because of the cost involved, their belief that France would not have been able to resist U.S. and British encroachment into Louisiana, and Jefferson's perceived hypocrisy.
Both Federalists and Jeffersonians were concerned over the purchase's constitutionality. Many members of the House of Representatives opposed the purchase. Majority Leader John Randolph led the opposition. The Federalists feared that the power of the Atlantic seaboard states would be threatened by the new citizens in the West, whose political and economic priorities were bound to conflict with those of the merchants and bankers of New England. There was also concern that an increase in the number of slave-holding states created out of the new territory would exacerbate divisions between North and South. A group of Northern Federalists led by Senator Timothy Pickering of Massachusetts went so far as to explore the idea of a separate northern confederacy. The House called for a vote to deny the request for the purchase, but it failed by two votes, 59–57. The Federalists even tried to prove the land belonged to Spain, not France, but available records proved otherwise.
The opposition of New England Federalists to the Louisiana Purchase was primarily economic self-interest, not any legitimate concern over constitutionality or whether France indeed owned Louisiana or was required to sell it back to Spain should it desire to dispose of the territory. The Northerners were not enthusiastic about Western farmers gaining another outlet for their crops that did not require the use of New England ports. Also, many Federalists were speculators in lands in upstate New York and New England and were hoping to sell these lands to farmers, who might go west instead if the Louisiana Purchase went through. They also feared that this would lead to Western states being formed, which would likely be Republican, and dilute the political power of New England Federalists.