What river runs through the Midwestern US through Nebraska the Dakotas Montana and other states?

The river that runs through the Midwestern US, including Nebraska, the Dakotas, and Montana, is the Missouri River. It is the longest river in North America, flowing for over 2,300 miles from its source in Montana to its confluence with the Mississippi River in St. Louis, Missouri. The Missouri River plays a significant role in the region's ecology, economy, and history.