Sentence:  As these Swiss were moving from the Selkirk settlement to become the first civilian residents of Minnesota , Dousman of Michilimackinac , Michigan , and Prairie du Chien was traveling to <WSD>Red</WSD> River to open a trade in merchandise . 
Meaning of the word marked with <WSD> tags:  a tributary of the Mississippi River that flows eastward from Texas along the southern boundary of Oklahoma and through Louisiana