History of St. Louis (1763–1803) History of St. Louis (1763–1803) The history of St. Louis, Missouri from 1763 to 1803 was marked by the transfer of French Louisiana to Spanish control, the founding of the city of St. Louis, its slow growth and role in the American Revolution under the rule of the Spanish, the transfer of the area to American control in the Louisiana Purchase, and its steady growth and prominence since then. In mid-1763, French Governor Jean-Jacques Blaise d'Abbadie granted a trade monopoly over the west upper Mississippi region to Gilbert Antoine de St. Maxent, a New Orleans merchant. Maxent quickly engaged the
Kingdom of Etruria secure the Kingdom of Etruria as a client state for Spain; Louisiana was first ceded by France to Spain in 1763 at the end of the Seven Years' War. Louisiana was duly transferred to France on 15 October 1802, after the signing of the Treaty of Aranjuez. Napoleon subsequently sold Louisiana in the Louisiana Purchase on December 20, 1803, in order pay for his French armies during the War of the Third Coalition. The first king (Louis I) died young in 1803, and his underage son Charles Louis succeeded him. His mother, Maria Luisa of Spain, was appointed regent. However,