The treaty finalizing the Louisiana Purchase is dated April 30 in Paris, but negotiations concluding around this date doubled the size of the young United States.

American negotiators signed a treaty with France doubling the size of the United States, acquiring roughly 828,000 square miles for about $15 million.

The U.S. Senate ratifies the treaty doubling the young nation's territory, buying 828,000 square miles from France for roughly $15 million.

As French forces evacuated Saint-Domingue following their defeat, Jean-Jacques Dessalines moved to finalize the declaration that would create Haiti, the first Black republic.

General Rochambeau surrendered the last French stronghold at Cap-Français, effectively ending France's brutal attempt to reconquer Saint-Domingue.

France formally transferred the Louisiana Territory to the United States in New Orleans, doubling the young nation's size for $15 million.