This is Montana: Montana's Greatest Wonder: The Missouri River (Part 4 of 5)

"... by every rule of nomenclature, the Missouri being the main stream and the upper Mississippi the tributary, the name of the former should have been given precedence, and the great-river should have been called Missouri from the Rocky Mountains to the Gulf of Mexico."

Many people, especially Montanans, agree with this unknown author's statement. However, the Mississippi was explored first an...