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Council Grove, city, seat (1871) of Morris county, east-central Kansas, U.S., on the Neosho River. The settlement started as an Indian campground in a grove of oaks near the river, where a treaty was concluded (1825) between the federal government and the Kansa and Osage Indians to permit the surveying of the Santa Fe Trail (from the Missouri River to Santa Fe, then in Mexican territory). The following year the first of many wagon trains...