What River forms the eastern border of Nebraska and flows into the Mississippi River?

This question isn't really answered yet but I'll get back to you and improve this when I find out the answer.

One river that flows into the Mississippi River is the Missouri River.

the Missouri River, Wisconsin River, Obion River, Vermillion River and Ohio River

the Missouri river, and the Ohio river.

Many rivers flow into the Mississippi River.The two largest are the Missouri from the west and the Ohio from the east.