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It flows into the Mississippi River. In 1805, Lewis and Clark used the Missouri River to navigate further west into Missouri valley which was part of the Louisiana Purchase (1803).

The Missouri River may be considered longer than the Mississippi if you include the rivers that are not actually named the Missouri but represent its main headwaters.

The Missouri River drains a vast area of the north central US, from Montana, Wyoming, and the Dakotas, across Nebraska and Kansas to Missouri. It defines part of the state borders for 5 states.

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11y ago

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