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
History of St. Louis (1763–1803) service of Jean Francois Le Dee and Pierre Laclède to build trading posts in the Illinois Country. Fur trading was becoming a more lucrative profession and many more started to travel up the Mississippi River for the same reason. Shortly before the upriver departure of Laclède in August 1763, word arrived that France had ceded its territory on the east bank of the Mississippi to Great Britain according to the Treaty of Paris (1763), giving new significance to the trading posts on the west bank. The group led by Laclède included his young stepson Auguste Chouteau and roughly twenty boatmen