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In page St. Louis:

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In 1764, after France lost the Seven Years' War, Pierre Laclède and his stepson Auguste Chouteau founded what was to become the city of St. Louis.[4] (French lands east of the Mississippi had been ceded to Great Britain and the lands west of the Mississippi to Spain; Catholic France and Spain were 18th-century allies. Louis XV of France and Charles III of Spain were cousins, both from the House of Bourbon.[citation needed]) The French families built the city's economy on the fur trade with the Osage, and with more distant tribes along the Missouri River. The Chouteau brothers gained a monopoly from Spain on the fur trade with Santa Fe. French colonists used African slaves as domestic servants and workers in the city.[citation needed]