when did louisiana become a part of the united states
Louisiana Purchase In 1798, Spain revoked the treaty allowing American use of New Orleans, greatly upsetting Americans. In 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.[4] The territory nominally remained under Spanish control, until a transfer of power to France on 30 November 1803, just three weeks before the formal cession of the territory to the United States on 20 December 1803.[5] A further ceremony was held in St. Louis a few months later partially due to winter conditions impeding the arrival of news, Upper Louisiana, regarding the New Orleans formalities. The 9â€“10 March 1804 event is remembered as Three Flags Day.