The Missouri. In fact, the "whole thing" is often referred to as the Missouri-Mississippi river system. It's huge, and is the largest river system in North America, and one of the largest ones in the world. You can find a link to an informative article below.
The second longest river the U.S is the Mississippi river
The Mississippi River is the largest river and it is the western border of Illinois. The Ohio and Wabash Rivers are the southern border of Illinois. The Illinois River is the largest internal river in Illinois.
The Mississippi River and its branches.
Many rivers flow into the Mississippi River. The two largest are the Missouri from the west and the Ohio from the east.
The Missouri River and the Mississippi River are the two longest rivers that are completely within the US. The Yukon River is the longest river but originates in Canada.
The Nile and the Amazon are the two longest rivers.
The Mississippi-Missouri-Jefferson system is the fourth longest and the tenth largest river in the world. In the US the Missouri is longest, but the Mississippi has the largest discharge of water by far.
They all are major rivers Also, they are all the largest river on their continents.
The Mississippi river is the largest river in North America and the longest river in the United States, but only if you consider the Mississippi-Missouri-Red Rock River as one river; this actual river (as opposed to stupidly misnamed tributaries) is the fourth-largest river in the world, after the Nile, the Amazon, and the Yangtze Rivers.
I may be wrong but I think its the Mississippi River. Sorry if I'm incorrect :( I am not going to be one of the people that answer nonsence. thanks for asking!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
The major rivers in Mississippi are Mississippi River, Big Black River, Pearl River, and Yazoo River.
The largest river flowing thru the Midwest is the Mississippi. This river begins in Minnesota and flows all the way to the Gulf of Mexico. Most other rivers dump into this mighty river. This river forms the Eastern border of states like Iowa, and Missouri and others. There is also the Missouri river. This is a large river was used by Native Americans, fur traders and Lewis and Clark for exploration. This river forms the Western border of Iowa and flows through Missouri to the Mississippi. In Iowa there are many rivers. The Des Moines river is one of the largest rivers. In Nebraska, the Platte river branches into many areas before joining into one large river. There are many other rivers in the Midwest. These are just a few.