The Convention of 1800, also known as the Treaty of Mortefontaine (French: ''Traité de Mortefontaine''), was signed on September 30, 1800, by the
United States
The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...
and
France
France, officially the French Republic, is a country located primarily in Western Europe. Overseas France, Its overseas regions and territories include French Guiana in South America, Saint Pierre and Miquelon in the Atlantic Ocean#North Atlan ...
. The difference in name was due to
congressional sensitivity at entering into treaties, due to disputes over the 1778 treaties of
Alliance
An alliance is a relationship among people, groups, or sovereign state, states that have joined together for mutual benefit or to achieve some common purpose, whether or not an explicit agreement has been worked out among them. Members of an a ...
and
Commerce
Commerce is the organized Complex system, system of activities, functions, procedures and institutions that directly or indirectly contribute to the smooth, unhindered large-scale exchange (distribution through Financial transaction, transactiona ...
between France and the U.S.
The Convention terminated the 1778 agreements, confirmed the principle of '
free trade, free goods' between the two countries and ended the 1798–1800
Quasi-War
The Quasi-War was an undeclared war from 1798 to 1800 between the United States and the French First Republic. It was fought almost entirely at sea, primarily in the Caribbean and off the East Coast of the United States, with minor actions in ...
, an undeclared naval war waged primarily in the
Caribbean
The Caribbean ( , ; ; ; ) is a region in the middle of the Americas centered around the Caribbean Sea in the Atlantic Ocean, North Atlantic Ocean, mostly overlapping with the West Indies. Bordered by North America to the north, Central America ...
. However, it failed to address the issue of compensation demanded by American ship owners for losses suffered before and during the Quasi-War, and as a result was not approved by Congress until December 1801.
By removing areas of friction between the two countries, it re-established Franco-American relations, and ultimately facilitated the 1803
Louisiana Purchase
The Louisiana Purchase () was the acquisition of the Louisiana (New France), 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#Watershed, Mississipp ...
.
Background

Under the
Treaty of Alliance (1778) with the then
Kingdom of France
The Kingdom of France is the historiographical name or umbrella term given to various political entities of France in the Middle Ages, medieval and Early modern France, early modern period. It was one of the most powerful states in Europe from th ...
, in return for financial and military assistance in the
American Revolutionary War
The American Revolutionary War (April 19, 1775 – September 3, 1783), also known as the Revolutionary War or American War of Independence, was the armed conflict that comprised the final eight years of the broader American Revolution, in which Am ...
, the
United States
The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...
agreed to defend French interests in the
Caribbean
The Caribbean ( , ; ; ; ) is a region in the middle of the Americas centered around the Caribbean Sea in the Atlantic Ocean, North Atlantic Ocean, mostly overlapping with the West Indies. Bordered by North America to the north, Central America ...
. As the treaty had no termination date, in theory this included backing the
French First Republic
In the history of France, the First Republic (), sometimes referred to in historiography as Revolutionary France, and officially the French Republic (), was founded on 21 September 1792 during the French Revolution. The First Republic lasted un ...
against
Britain
Britain most often refers to:
* Great Britain, a large island comprising the countries of England, Scotland and Wales
* The United Kingdom of Great Britain and Northern Ireland, a sovereign state in Europe comprising Great Britain and the north-eas ...
in the 1792–1797
War of the First Coalition
The War of the First Coalition () was a set of wars that several European powers fought between 1792 and 1797, initially against the Constitutional Cabinet of Louis XVI, constitutional Kingdom of France and then the French First Republic, Frenc ...
. Despite popular enthusiasm for the
French Revolution, there was little support for this in
Congress
A congress is a formal meeting of the representatives of different countries, constituent states, organizations, trade unions, political parties, or other groups. The term originated in Late Middle English to denote an encounter (meeting of ...
, since neutrality allowed Northern shipowners to earn huge profits evading the British blockade of French ports, while Southern plantation-owners feared the example set by France's
abolition of colonial slavery in 1794.
Arguing the
Execution of Louis XVI
Louis XVI, former Bourbon King of France since the Proclamation of the abolition of the monarchy, abolition of the monarchy, was publicly executed on 21 January 1793 during the French Revolution at the ''Place de la Révolution'' in Paris. At Tr ...
in 1793 voided existing agreements, the American government passed the
Neutrality Act of 1794, which unilaterally cancelled the military obligations of the 1778 treaty. France accepted, on the basis of "benevolent neutrality"; this meant allowing French
privateers access to US ports, and the right to sell British prizes in American
prize courts, but not vice versa.
It was soon apparent the U.S. interpreted "neutrality" differently, while the 1794
Jay Treaty
The Treaty of Amity, Commerce, and Navigation, Between His Britannic Majesty and the United States of America, commonly known as the Jay Treaty, and also as Jay's Treaty, was a 1794 treaty between the United States and Great Britain that averted ...
with Britain directly contradicted the 1778
Treaty of Amity and Commerce. When France retaliated by seizing American ships trading with the British, an effective response was hampered by
Jeffersonian resistance to a permanent military force. Instead, the U.S. suspended repayment of loans made by France during the Revolutionary War; efforts to resolve this through diplomacy ended in the 1797 dispute known as the
XYZ Affair
The XYZ Affair was a political and diplomatic episode in 1797 and 1798, early in the presidency of John Adams, involving a confrontation between the History of the United States (1789–1849), United States and French First Republic, Republican ...
, which worsened the situation.
The U.S. was also concerned by French ambitions in North America, especially in its former territory of
Louisiana
Louisiana ( ; ; ) is a state in the Deep South and South Central regions of the United States. It borders Texas to the west, Arkansas to the north, and Mississippi to the east. Of the 50 U.S. states, it ranks 31st in area and 25 ...
, acquired by
Spain
Spain, or the Kingdom of Spain, is a country in Southern Europe, Southern and Western Europe with territories in North Africa. Featuring the Punta de Tarifa, southernmost point of continental Europe, it is the largest country in Southern Eur ...
in 1762. For decades, American settlers had been moving into this area, despite diplomatic efforts to manage it, including the 1795
Pinckney's Treaty
Pinckney's Treaty, also known as the Treaty of San Lorenzo or the Treaty of Madrid, was signed on October 27, 1795, by the United States and Spain.
It defined the border between the United States and Spanish Florida, and guaranteed the United S ...
. By 1800, nearly 400,000 or 7.3% of Americans lived in
trans-Appalachia
Trans-Appalachia is an area in the United States bounded to the east by the Appalachian Mountains and extending west roughly to the Mississippi River. It spans from the Midwest to the Upper South. The term is used most frequently when referring to ...
n territories, including the new states of
Kentucky
Kentucky (, ), officially the Commonwealth of Kentucky, is a landlocked U.S. state, state in the Southeastern United States, Southeastern region of the United States. It borders Illinois, Indiana, and Ohio to the north, West Virginia to the ...
and
Tennessee
Tennessee (, ), officially the State of Tennessee, is a landlocked U.S. state, state in the Southeastern United States, Southeastern region of the United States. It borders Kentucky to the north, Virginia to the northeast, North Carolina t ...
.
Western economic development required access to the
Mississippi River
The Mississippi River is the main stem, primary river of the largest drainage basin in the United States. It is the second-longest river in the United States, behind only the Missouri River, Missouri. From its traditional source of Lake Ita ...
, particularly the vital port of
New Orleans
New Orleans (commonly known as NOLA or The Big Easy among other nicknames) is a Consolidated city-county, consolidated city-parish located along the Mississippi River in the U.S. state of Louisiana. With a population of 383,997 at the 2020 ...
, and the U.S. much preferred a weak Spain to an aggressive and powerful France on their western and southern borders. The discovery that French agents were conducting military surveys to determine how best to defend Louisiana led to the 1798
Alien and Sedition Acts
The Alien and Sedition Acts of 1798 were a set of four United States statutes that sought, on national security grounds, to restrict immigration and limit 1st Amendment protections for freedom of speech. They were endorsed by the Federalist Par ...
.
With most of their fleet confined to port by the
Royal Navy
The Royal Navy (RN) is the naval warfare force of the United Kingdom. It is a component of His Majesty's Naval Service, and its officers hold their commissions from the King of the United Kingdom, King. Although warships were used by Kingdom ...
, the French relied on privateers operating off the U.S. coastline, and in the Caribbean. On July 7, 1798, Congress cancelled the 1778 Treaties and authorised attacks on French warships in American waters, resulting in the
Quasi-War
The Quasi-War was an undeclared war from 1798 to 1800 between the United States and the French First Republic. It was fought almost entirely at sea, primarily in the Caribbean and off the East Coast of the United States, with minor actions in ...
of 1798–1800. By arming 200 merchant ships, expanding the
Navy
A navy, naval force, military maritime fleet, war navy, or maritime force is the military branch, branch of a nation's armed forces principally designated for naval warfare, naval and amphibious warfare; namely, lake-borne, riverine, littoral z ...
, and informal co-operation with the British, the U.S. re-established control over its home waters.
However, President
John Adams
John Adams (October 30, 1735 – July 4, 1826) was a Founding Fathers of the United States, Founding Father and the second president of the United States from 1797 to 1801. Before Presidency of John Adams, his presidency, he was a leader of ...
remained keen to reach a diplomatic solution, and in early 1799, a diplomatic commission was approved, consisting of
William Vans Murray,
Oliver Ellsworth
Oliver Ellsworth (April 29, 1745 – November 26, 1807) was a Founding Father of the United States, Attorney at law, attorney, jurist, politician, and diplomat. Ellsworth was a framer of the United States Constitution, United States senator fr ...
, and
William Richardson Davie. Their objectives were to formally terminate the 1778 treaties, confirm American neutrality, agree compensation for shipping losses and end the Quasi-War, although they did not arrive in
Paris
Paris () is the Capital city, capital and List of communes in France with over 20,000 inhabitants, largest city of France. With an estimated population of 2,048,472 residents in January 2025 in an area of more than , Paris is the List of ci ...
until early 1800.
During this delay, the
French Directory
The Directory (also called Directorate; ) was the system of government established by the Constitution of the Year III, French Constitution of 1795. It takes its name from the committee of 5 men vested with executive power. The Directory gov ...
was overthrown in November 1799, and replaced by the
Consulate
A consulate is the office of a consul. A type of mission, it is usually subordinate to the state's main representation in the capital of that foreign country (host state), usually an embassy (or, only between two Commonwealth countries, a ...
, headed by
Napoleon
Napoleon Bonaparte (born Napoleone di Buonaparte; 15 August 1769 – 5 May 1821), later known by his regnal name Napoleon I, was a French general and statesman who rose to prominence during the French Revolution and led Military career ...
. He was also keen on ending hostilities, since an important part of his support came from wealthy merchants, who wanted to re-establish their control over sugar-producing islands in the Caribbean. These were extremely profitable; prior to the abolition of slavery in 1793, the colony of
Saint-Domingue
Saint-Domingue () was a French colonization of the Americas, French colony in the western portion of the Caribbean island of Hispaniola, in the area of modern-day Haiti, from 1659 to 1803. The name derives from the Spanish main city on the isl ...
produced more sugar and coffee than all the
British West Indies
The British West Indies (BWI) were the territories in the West Indies under British Empire, British rule, including Anguilla, the Cayman Islands, the Turks and Caicos Islands, Montserrat, the British Virgin Islands, Bermuda, Antigua and Barb ...
combined.
Negotiations

Formal discussions with the recently re-appointed Foreign Minister
Talleyrand did not begin until April and proceeded slowly. The main problem was the U.S. demand for $20 million compensation for shipping losses, which the Commissioners had been instructed to resolve before discussing revised treaties. As the French pointed out, measures taken by the Directory against American commerce had been annulled by the new government, while those imposed by the U.S. had just been renewed. They argued compensation only applied only if the 1778 treaties remained in force; either the U.S. confirmed the existing treaties and received compensation, or insisted on new ones and received none.
However, Talleyrand accepted the treaties could not be enforced, and preferred to reach an amicable agreement with the U.S., rather than drive it into an informal alliance with Britain, which was one impact of the Quasi-War. American neutrality was essential for French plans for North America; under the secret
Third Treaty of San Ildefonso
The Third Treaty of San Ildefonso was a secret agreement signed on 1 October 1800 between Spain and the French Republic by which Spain agreed in principle to exchange its North American colony of Louisiana for territories in Tuscany. The terms we ...
of October 1800, Spain agreed to transfer Louisiana to France in return for territories in Italy.
In July 1800,
Russia
Russia, or the Russian Federation, is a country spanning Eastern Europe and North Asia. It is the list of countries and dependencies by area, largest country in the world, and extends across Time in Russia, eleven time zones, sharing Borders ...
, with informal French support, established the
Second League of Armed Neutrality, whose signatories agreed to resist the British policy of searching neutral ships for contraband. This allowed Talleyrand to concede the principle of "free trade, free goods, freedom of convoy" demanded by the Americans, while victories at
Marengo in June, and
Hohenlinden in December forced Emperor
Francis II to make peace. In the February 1801
Treaty of Lunéville
The Treaty of Lunéville (or Peace of Lunéville) was signed in the Treaty House of Lunéville on 9 February 1801. The signatory parties were the French Republic and Emperor Francis II, who signed on his own behalf as ruler of the hereditary do ...
, he ceded Austrian territories in Italy demanded by Spain in the Treaty of San Ildefonso.
Terms
Talleyrand now had all the pieces in place to re-establish a French presence in North America; although the American commissioners did not have details of the Louisiana agreement, they were aware of the strength of his position and anxious to make a deal. The Convention signed on 30 September contained 27 clauses, the majority of which related to commercial affairs; these protected each other's merchants from having their goods confiscated, and guaranteed both sides
most favoured nation
In international economic relations and international politics, most favoured nation (MFN) is a status or level of treatment accorded by one state to another in international trade. The term means the country which is the recipient of this treatme ...
trading status.
The most important and controversial was Clause II, which agreed to 'postpone' discussions on compensation, and suspended the 1778 treaties until this was resolved. Although the convention was dated September 30, 1800, arguments over the inclusion of Clause II meant Congress did not ratify the agreement until December 21, 1801. In the end, the U.S. government agreed to compensate its citizens for the claimed damages of $20 million, although it was only in 1915 the heirs finally received $3.9 million in settlement.
Aftermath
At the time, the Convention was generally viewed unfavorably in the U.S., as it failed to agree compensation, or address concerns over French ambitions in North America. More recent historians argue that by ending the dispute with France, it ultimately facilitated the
Louisiana Purchase
The Louisiana Purchase () was the acquisition of the Louisiana (New France), 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#Watershed, Mississipp ...
, while reaching agreement on commercial terms was essential, since the U.S. was not strong enough to enforce them on its own.
Negotiations between France and Britain to end the
War of the Second Coalition
The War of the Second Coalition () (1798/9 – 1801/2, depending on periodisation) was the second war targeting French Revolution, revolutionary French First Republic, France by many European monarchies, led by Kingdom of Great Britain, Britai ...
resulted in the March 1802
Treaty of Amiens
The Treaty of Amiens (, ) temporarily ended hostilities between France, the Spanish Empire, and the United Kingdom at the end of the War of the Second Coalition. It marked the end of the French Revolutionary Wars; after a short peace it set t ...
; although widely viewed as a short-lived truce, it gave Napoleon an opportunity to activate his plans for North America. In December 1801, 30,000 veteran French troops
were sent to Saint-Domingue, and soon after, Spain
confirmed the transfer of Louisiana to France.
This caused great concern in Congress, but by 1803, it was clear the expedition was a catastrophic failure. Its leader, General
Charles Leclerc
Charles Marc Hervé Perceval Leclerc (; born 16 October 1997) is a Monégasque racing driver who competes in Formula One for Ferrari. Leclerc was runner-up in the Formula One World Drivers' Championship in with Ferrari, and has won Grands ...
, died of
yellow fever, along with an estimated 22,000 of his men. Without Saint-Domingue, Napoleon concluded Louisiana was irrelevant, and with France and Britain once again on the verge of hostilities, he decided to sell the territory to fund his campaigns in Europe. In April 1803, the U.S. purchased the territory for $15 million, or 80 million francs.
References
Sources
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{{DEFAULTSORT:Convention of 1800
Quasi-War
1800 in France
1800 in the United States
1800 treaties
Peace treaties of the French Revolutionary Wars
Treaties of the French First Republic
Treaties of the United States
France–United States relations
1800 in international relations
September 1800
Joseph Bonaparte