Fort Osage - View this location on map Established in 1808 by General William Clark (1770-1838) for the protection and promotion of trade with the Osage Indians, Fort Osage was one of the most successful of 28 trading houses operated from 1795 to 1822 under the U.S. Government's factory system. The fort served as the point from which distances were measured by the Federal Survey of 1825. North side of town, Sibley, Missouri Historical

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