Weeks at Fort Union on the upper Missouri

The context passage states that two years after Catlin's 1830 journey began, he ascended the Missouri River more than 3,000 km (1,900 miles) to Fort Union Trading Post, near what is now the North Dakota-Montana border, where he spent several weeks among indigenous people still relatively untouched by European culture. The 1832 year is an inference from the 'two years later' phrasing rather than an explicit date, and the passages do not name the Sioux for this stay, so the event title's 'living among the Sioux' is softened to a several-week stay. The legacy row's 1 January day and 'Dakota Territory' location are not supported and are not retained.