Two of the United States biggest rivers meet in St Louis Missouri. The Mississippi River and the Missouri River both meet in St Louis.
The mouth of the Colorado River is the Gulf of California
Probably the Missouri river and the Colorado river.
Mississippi, Colorado, Columbia, Rio Grande, Missouri
The most well known is the Mississippi--it's also the largest. The other main river is the Colorado.
The Missouri and Mississippi Rivers come together just north of St. Louis.
The major rivers are the the Missouri, Ohio, and the Arkansas River. Other tributaries are the Minnesota River (Minnesota), Illinois River (Illinois), White River (Arkansas), Yazoo River (Mississippi), and part of the Red River (Louisiana).
There are plenty of states that have rivers with the same names. Theres the Kansas river, Missouri River, Mississippi River, and plenty more but those are examples of states that have rivers with the same name.
The Mississippi River and the Missouri River are two separate rivers.
The Arkansas River arises in Colorado and still has that name when it flows into the Mississippi. It's the only Colorado river I know of that flows directly into the Mississippi. The Platte (both the North and South) arise in Colorado and join in Nebraska before flowing into the Missouri, which then joins the Mississippi. The Republican and Smoky Hill Rivers join in Kansas to form the Kansas River, which then flows into the Missouri and thence the Mississippi. All other significant Colorado rivers that don't join one of the above either wind up in the Rio Grande or the Colorado River, neither of which ever joins the Mississippi.
Mississippi River, Missouri River, Ohio River, Tennessee River, Colorado River, Columbia River and the Rio Grande are the more significant rivers in the U.S.
The Ohio and Mississippi rivers to name two.