Which are two of the longest rivers in the U.S.?

The Missouri and the Mississippi River are indeed two of the longest rivers in the United States. The Missouri River is approximately 2,341 miles long, making it the longest river in the U.S., while the Mississippi River, at about 2,340 miles, is the second longest. Together, they form a significant watershed in North America, playing vital roles in the geography, ecology, and economy of the regions they traverse.

The Colorado and the Ohio River, the Rio Grande and the Hudson River, as well as the Thames and the Seine River, do not match the lengths of the Missouri and Mississippi Rivers. The Colorado River is known for its stunning canyons and recreational opportunities but is not among the longest rivers. The same goes for the Ohio River, which, while important historically and geographically, falls short in comparison to the Missouri and Mississippi. The Rio Grande is also not as long as these two rivers, and the Hudson, Thames, and Seine rivers are not located in the U.S., further distinguishing the correct answer as the most accurate choice regarding the longest rivers in the country.