answers: Napoleon
context: in the American Revolutionary War, the Spanish didn't want the Americans to settle in their territory. Although the purchase was thought of by some as unjust and unconstitutional, Jefferson determined that his constitutional power to negotiate treaties allowed the purchase of what became fifteen states. In hindsight, the Louisiana Purchase could be considered one of his greatest contributions to the United States. On April 18, 1802, Jefferson penned a letter to United States Ambassador to France Robert Livingston. It was an intentional exhortation to make this supposedly mild diplomat strongly warn the French of their perilous course. The letter began: </s> in 1803, Livingston made this famous statement, "We have lived long, but this is the noblest work of our whole lives... From this day the United States take their place among the powers of the first rank." The United States Senate advised and consented to ratification of the treaty with a vote of twenty-four to seven on October 20. The Senators who voted against the treaty were: Simeon Olcott and William Plumer of New Hampshire, William Wells and Samuel White of Delaware, James Hillhouse and Uriah Tracy of Connecticut, and Timothy Pickering of Massachusetts. On the following day, October 21, </s> 1801, Spanish Governor Don Juan Manuel de Salcedo took over from the Marquess of Casa Calvo, and restored the American right to deposit goods. However, in 1800 Spain had ceded the Louisiana territory back to France as part of Napoleon's secret Third Treaty of San Ildefonso. The territory nominally remained under Spanish control, until a transfer of power to France on November 30, 1803, just three weeks before the formal cession of the territory to the United States on December 20, 1803. A further ceremony was held in St. Louis, Upper Louisiana regarding the New Orleans formalities. The March 9–10,
question: who sold the louisiana purchase to the us