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
West Florida Controversy bear in mind that in the transfer [of Louisiana to the United States] the identical language was employed that had been used in 1800, so that the government of the United States was subrogated, in express terms, to the rights of France and of Spain. … The United States insisted that by the treaty of 1800 Spain ceded the disputed territory [of West Florida], as part of Louisiana, to France, and that France, in turn, in 1803, ceded it to the United States. Spain, with equal earnestness and persistence, maintained that her cession to France comprehended what was at that