What is Missouri River?
{{Infobox river | name = Missouri River | image =Wpdms nasa topo missouri river.jpg | image_size = 260px | image_caption = A map showing the Missouri River. | source1_location = [[Rocky Mountains]], [[Montana]] | mouth = [[Mississippi River]] | subdivision_type1 = Countries | subdivision_name1 = [[United States]], [[Canada]] | length = {{convert|2341|mi|km|abbr=on}} | source1_elevation = {{convert|9030|ft|m|abbr=on}} | mouth_elevation = {{convert|404|ft|m|abbr=on}} | discharge1_avg= {{convert|87520|cuft/s|m3/s|abbr=on}} | basin_size = {{convert|529350|mi2|km2|abbr=on}} }} The '''Missouri River''' is a [[river]] in the western [[United States]]. It is a [[tributary]] of the [[Mississippi River]]. It is longer than the Mississippi River. It is, in fact, the longest river in [[North America]]. ==Geography== For most of its course, the Missouri flows across the [[Great Plains]], one of the driest parts of [[North America]]. The source of the Missouri River is in the [[Rocky Mountains]], in the state of [[Montana]]. The Missouri flows eastward, across Montana, south of the border with Canada. It enters the state of [[North Dakota]] and then it turns south. It flows through [[South Dakota]]. Then it flows past [[Iowa]], [[Nebraska]], [[Missouri]], and [[Kansas]]. Near the city of [[Kansas City, Missouri]], the Missouri turns eastward into the state of Missouri. It flows eastward across the state of Missouri. It joins the Mississippi just north of the city of [[Saint Louis, Missouri]]. The Missouri has many important [[tributary|tributaries]], including the [[Yellowstone River]], the [[Platte River]], and the [[Kansas River]]. ==History== The Missouri was very important for the [[Native Americans]] who lived on the Great Plains. It was also very important in the history of the United States. The Missouri was used as the route of the [[Lewis and Clark Expedition]] in 1804-1806. In the [[19th century]], the Missouri was very important in the [[fur trade|North American fur trade]] and fo