The Third Treaty of San Ildefonso, signed in secrecy on October 1, 1800, envisaged the transfer of Western Louisiana as well as New Orleans to France in exchange for the Duchy of Parma. The transfer was confirmed by the Treaty of Aranjuez signed on March 21, 1801. However, Napoleon Bonaparte soon decided not to keep the immense territory. The army he sent to take possession of the colony was first required to put down a revolution in Saint-Domingue (now Haiti); its failure to do so, and the rupture of the Treaty of Amiens with the United Kingdom, prompted him to decide to sell Louisiana to the newly founded United States. This was done on April 30, 1803 for the sum of 80 million francs (15 million dollars). American sovereignty was established on December 20, 1803.