rather than the Spanish in their fight for control of the Mississippi region. In 1725, Bourgmont led a delegation of Osage and other tribal chiefs to Paris. They were shown around France, including a visit to Versailles, Château de Marly and Fontainebleau. They hunted with Louis XV in the royal forest and saw an opera. During the French and Indian War (the North American front of the Seven Years' War), France was defeated by Great Britain and in 1763 ceded control over their lands east of the River Mississippi to the British Crown. The French Crown made a separate deal with Spain, which took nominal control of much of the Illinois Country west of the great river. By the late 18th century, the Osage did extensive business with the French Creole fur trader René Auguste Chouteau, who was based in St. Louis; the city was part of territory under nominal Spanish control after the Seven Years' War but was dominated by French colonists. They were the de facto European power in St. Louis and other settlements along the Mississippi, building their wealth on the fur trade. In return for the Chouteau brothers' building a fort in the village of the Great Osage southwest of St. Louis, the Spanish regional government gave the Chouteaus a six-year monopoly on trade (1794–1802). The Chouteaus named the post Fort Carondelet after the Spanish governor. The Osage were pleased to have a fur trading post nearby, as it gave them access to manufactured goods and increased their prestige among the tribes. Lewis and Clark reported in 1804 that the peoples were the Great Osage on the Osage River, the Little Osage upstream, and the Arkansas band on the Verdigris River, a tributary of the Arkansas River. The Osage then numbered some 5,500. The Osage and Quapaw suffered extensive losses from smallpox in 1801–1802. Historians estimate up to 2,000 Osage died in the epidemic. In 1804 after the United States made the Louisiana Purchase, the U.S. government appointed the wealthy French fur trader Jean-Pierre Chouteau, a half-brother of René Auguste Chouteau, as the Indian agent assigned to the Osage. In 1809, he founded the Saint Louis Missouri Fur Company with his son Auguste Pierre Chouteau and other prominent men of St. Louis, most of whom were of French-Creole descent, born in North America. Having lived with the Osage for many years and learned their language, Jean-Pierre