dr van dr found the mouth .
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Jacques Marquette found the Mississippi River ,Arkansas River and the Chicago River .
The French port at the mouth of the Mississippi River is New Orleans. Robert Cavalier de la Salle visited and claimed the area in 1682 for France.
It's mouth was found and the mythes of a "NorthWest Passage" were ended- rightfully. -Em the 5th Gr.
The explorer that Decovered the Mississippi River was Louis Joliet (1645-1700) and one of his voyagers Maquette.