What are the 2 longest rivers in the United States?

The two longest rivers in the United States are the Mississippi and Missouri Rivers. The Mississippi River, flowing approximately 2,340 miles, is the second-longest river in North America and runs from northern Minnesota to the Gulf of Mexico. The Missouri River, which is about 2,341 miles long, is often considered the longest river in North America when combined with the Mississippi, as it flows into it and contributes significantly to its length.

This choice is based on their extensive lengths and their significance in the geography and history of the United States. Together, they also form one of the largest river systems in the country, which has been vital for transportation, trade, and settlement throughout U.S. history. Other river pairs in the options presented, such as the Rio Grande and Colorado Rivers, or the Ohio and Tennessee Rivers, do not match the combined length of the Mississippi and Missouri Rivers.