Posted by katie on Thursday, September 18, 2008 at 6:02pm.
The Mississippi River
Most sources claim the longest river is the Missouri.
http://www.enchantedlearning.com/usa/rivers/
http://www.worldatlas.com/webimage/countrys/nariv.htm
http://www.socialstudiesforkids.com/articles/geography/longestriversintheworld.htm
http://en.wikipedia.org/wiki/List_of_rivers_by_length#List_of_rivers_longer_than_1000_km
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