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

The Rio Grande is recognized as one of the two longest rivers in the United States, stretching approximately 1,896 miles. It forms a significant part of the U.S.-Mexico border and has historical importance in terms of exploration and settlement in the American Southwest. This river is also notable for its cultural significance and the diverse ecosystems it supports.

In contrast, the Missouri River, while also one of the longest rivers in North America at about 2,341 miles when considering its length as part of the larger Mississippi-Missouri river system, is the longest river in the U.S. itself. The other rivers like the Hudson are considerably shorter and do not have the same standing when comparing their lengths to the major rivers in the country.