St. Louis: History
=== Mississippian culture and European exploration ===
The area that became St. Louis was a center of the Native American Mississippian culture, which built numerous temple and residential earthwork mounds on both sides of the Mississippi River. Their major regional center was at Cahokia Mounds, active from 900 to 1500. Due to numerous major earthworks within St. Louis boundaries, the city was nicknamed "Mound City". These mounds were mostly demolished during the city's development. Historic Native American tribes in the area encountered by early Europeans included the Siouan-speaking Osage people, whose territory extended west, and the Illiniwek. Sugarloaf Mound in South St. Louis was repatriated to the Osage Nation in 2025.
European exploration of the area was first recorded in 1673, when French explorers Louis Jolliet and Jacques Marquette traveled through the Mississippi River valley. Five years later, La Salle claimed the region for France as part of La Louisiane, also known as Louisiana. The earliest European settlements in the Illinois Country (also known as Upper Louisiana) were built by the French during the 1690s and early 1700s at Cahokia, Kaskaskia, and Fort de Chartres. Migrants from the French villages on the east side of the Mississippi River, such as Kaskaskia, also founded Ste. Genevieve in the 1730s.
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. (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.) 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.
During the negotiations for the 1763 Treaty of Paris, French negotiators agreed to transfer France's colonial territories west of the Mississippi and Missouri rivers to New Spain to compensate for Spanish territorial losses during the war. These areas remained under Spanish control until 1803, when they were transferred to the French First Republic. During the American Revolutionary War, St. Louis was unsuccessfully attacked by British-allied Native Americans in the 1780 Battle of St. Louis. …