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
France in the Seven Years' War the Spanish involvement did not provide the relief to the French that had been hoped. Instead French troops were needed to bolster Spanish efforts to invade Portugal, and became bogged down there. Spain also suffered defeats in Cuba and the Philippines in 1762, and by the end of the year both Spain and France were urgently seeking peace. France began asserting control over the Ohio Country as early as 1749, issuing warnings and threats to British colonial traders active in the region. When the French began constructing a series of forts in the Ohio River watershed in 1753, the British