Louisiana Purchase
1803 · 19th Century
On April 30, 1803, the United States purchased approximately 828,000 square miles of territory west of the Mississippi River from France for $15 million, roughly four cents per acre. Napoleon Bonaparte sold the land after the collapse of French military operations in Saint-Domingue and the prospect of renewed war with Britain made the territory strategically untenable. The treaty, negotiated by Robert Livingston and James Monroe in Paris, doubled the physical size of the United States.
Key Figures
Thomas JeffersonJames MonroeRobert LivingstonNapoleon BonaparteFrançois Barbé-Marbois
Locations
Washington, D.C.Paris, FranceHôtel TubeufNew OrleansLouisiana Territory
Topics
land deallouisiana purchaseFranceunited statescurriculum5th grade
Connected Events — 8 Connections
The Louisiana Purchase created the legal framework and territorial acquisition that made the Lewis and Clark Expedition both necessary and possible - Jefferson needed to map, catalog, and establish American presence in the vast new territory Lewis and Clark Expedition Begins
Provided the territorial foundation and legal framework for westward expansion that made a transcontinental railroad both geographically possible and economically necessary to connect distant territories to eastern markets Transcontinental Railroad is Completed
Established the precedent and constitutional framework for major territorial acquisitions through treaty purchase rather than conquest, providing the legal and political template Seward used for Alaska Alaska Purchase
The Louisiana Purchase eliminated France as a North American power and made Britain's Canadian territories strategically isolated, contributing to British impressment of American sailors and trade restrictions that directly provoked the War of 1812 War of 1812 Begins
Napoleon's sale of Louisiana to fund his European campaigns freed him from American entanglements and provided resources that supported his transformation from First Consul to Emperor, while the diplomatic success enhanced his prestige before the coronation Napoleon Bonaparte Crowned Emperor of France
The Louisiana Purchase expanded western territory, increasing demand for transportation routes the Erie Canal partially addressed Construction of the Erie Canal
Demonstrated American territorial expansion doctrine that emboldened settlers to claim California through similar means California Republic (Bear Flag Revolt)
The Northwest Ordinance established the constitutional and administrative framework for territorial acquisition and statehood that Jefferson directly applied to the Louisiana Purchase, using the three-stage territorial governance model to organize the massive new western territories Northwest Ordinance Establishes Northwest Territory
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