Retrocession of Louisiana

Spain formally retrocedes Louisiana to France at the Cabildo

France took formal possession of Louisiana after it had already contracted to sell the province to the United States. The French flag's official interval in New Orleans lasted twenty days.

30 November 1803, in the council hall

Spanish and French officials assembled in the New Orleans city hall — the Cabildo — on 30 November 1803 for the formal transfer of Louisiana. French colonial prefect Pierre Clément de Laussat presented the full powers issued to him by First Consul Bonaparte.

Governor Manuel de Salcedo and Sebastián Calvo de la Puerta y O'Farrill, Marqués de Casa Calvo, declared Louisiana, its dependencies, and the city and island of New Orleans placed in Laussat's possession for the French Republic.

The two commissioners then solemnly delivered the keys of New Orleans and released inhabitants choosing French allegiance from their oath to the Spanish king.

Twenty days of French Louisiana

Spain had promised the province to France in the secret Treaty of San Ildefonso of 1800, and a royal order dated 15 October 1802 authorized Salcedo and Casa Calvo to deliver it to the French commissioner.

By the time they did, the Louisiana Purchase treaty of 30 April 1803 had already been concluded and ratified. Laussat handed the province to United States commissioners in the same Cabildo on 20 December.

The purchase consideration was $15 million in two parts: $11.25 million paid to France and the assumption of up to $3.75 million in American claims.

A protocol with no borders in it

The document did not define the province's outer limits. It repeated treaty language describing Louisiana as it then existed, as France had formerly possessed it, and as subsequent treaties required — three overlapping formulas instead of a line on a map.

Sovereignty changed formally at New Orleans, but Upper Louisiana around St. Louis stayed under Spanish administration until separate ceremonies in March 1804.

The ceremony transferred European imperial claims; the consent of the many Indigenous nations governing and occupying the land was neither requested nor obtained.

Sources

Researched 24 Aug 2026 6 sources not yet audited Date corrected

How this was checked

Researched from the web into a fact sheet and rewritten from that sheet. This article has not yet had an independent model audit. How the pipeline works →

Date corrected. The research places this at 1803-11-30.

What the sources leave uncertain

The exact outer boundaries of the province transferred were not defined clearly. The protocol repeated treaty language describing Louisiana as it then existed, as France had formerly possessed it, and as subsequent treaties required.
The 30 November ceremony transferred sovereignty formally at New Orleans, but Upper Louisiana around St. Louis remained under Spanish administration until ceremonies in March 1804.