What is one of the two longest rivers in the United States?

The Missouri River is recognized as one of the two longest rivers in the United States, measuring approximately 2,341 miles in length. It flows through several states, including Montana, North Dakota, South Dakota, Nebraska, Iowa, Kansas, and Missouri, before it merges with the Mississippi River. Its significant length and role as a major waterway contribute to its prominence among the longest rivers in the country.

The Ohio River, while an important river in the eastern United States, is shorter than the Missouri River. The Rio Grande, while it is a notable river primarily marking the border between the United States and Mexico, does not rival the length of the Missouri River. Similarly, the Columbia River, which flows into the Pacific Ocean, is also not as long, making the Missouri River the clear choice in this context.