April 30, 1803

Louisiana Purchase

Louisiana Purchase terms concluded and treaty instruments dated

Two days after the celebrated treaty date, the American negotiator wrote that the parties would 'probably sign tomorrow.' The Louisiana Purchase treaty was dated to the day of agreement, not the day of signing.

30 April 1803: the day the terms were settled

On 30 April 1803 in Paris, the American envoys Robert R. Livingston and James Monroe and the French treasury minister François Barbé-Marbois concluded the terms under which France would cede Louisiana to the United States. That is what actually happened on the famous date — agreement on terms, not a signing ceremony.

The instruments were officially dated 30 April but physically signed several days later; the Library of Congress gives 2 May, and Livingston's own letter of 2 May told Jefferson the parties would 'probably sign tomorrow.'

Three documents, and a price that wasn't cash

The purchase was not one treaty but three instruments: a treaty of cession and two financial conventions. The nominal price of $15 million (80 million francs) split into $11.25 million paid to France in United States stock and up to $3.75 million covering American claims against France.

The envoys had been authorized to spend $10 million on New Orleans and the Floridas. They came away committed to a continental cession of roughly 828,000 square miles — after Talleyrand unexpectedly asked on 11 April whether the United States would buy the whole territory, followed by a French opening ask of 100 million francs plus claims.

What the treaty didn't settle

Nothing changed hands on 30 April. Ratification came in October; Spain formally delivered Louisiana to France in New Orleans only on 30 November; the transfer to the United States followed in December.

The treaty described its boundaries only by reference to earlier French and Spanish holdings, leaving later governments to argue over what had been bought. And France sold sovereignty over territory inhabited and governed by Indigenous nations who were not parties to any of the three documents — the neat map of a purchased parcel was drawn long after the ink dried.

Sources

Researched 22 Aug 2026 7 sources 1 audit pass, 1 issue open Traditional date

How this was checked

Researched from the web into a fact sheet, rewritten from that sheet, then audited against it by a different model. How the pipeline works →

Traditional date. This date is the conventional one, not one fixed by a contemporary record.

What the sources leave uncertain

April 30 is the official and traditional treaty date because the instruments were antedated to the day the terms were settled. Documentary editions and the Library of Congress report that formal signing occurred later, commonly given as 2 May.
The treaty did not clearly delineate all boundaries, making later claims about its exact modern-state coverage retrospective.
The transaction purported to transfer French sovereignty, not unencumbered ownership of land occupied and governed by Indigenous nations.