Name one of the two longest rivers in the United States.

The Mississippi River is one of the two longest rivers in the United States, spanning approximately 2,340 miles from its source at Lake Itasca in Minnesota to its mouth at the Gulf of Mexico. It serves as a vital waterway for transportation, commerce, and agriculture, and it plays a significant role in the ecology and economies of the surrounding regions. The river is notable not just for its length, but also for its historical and cultural significance, having been a crucial route for exploration, trade, and the movement of people throughout American history.

The other river that competes for the title of the longest is the Missouri River, which is often considered the longest when its tributaries are factored in, but the Mississippi holds the title as the longest river entirely within the U.S. borders. The other rivers listed, while significant in their own right, do not compare in length to the Mississippi River.