What river forms the boundary between the United States and Mexico?

What river forms the boundary between the United States and Mexico?

• A. Rio Grande
• B. Colorado River
• C. Mississippi River
• D. Bravo River

Answer: (A)

The boundary between the United States and Mexico is defined by a natural waterway that runs along a large portion of Texas. The Rio Grande flows from southern Colorado down to the Gulf of Mexico, forming the border between Texas and northern Mexico for much of its course. This long, shared boundary is reinforced by historical treaties, which used the river as the dividing line in significant stretches. Other rivers listed do not run as the main border between the two nations across this region: the Colorado River doesn’t define the Texas–Mexico boundary, the Mississippi is well inland, and the Bravo River isn’t the boundary in question. So, the Rio Grande is the river that marks the U.S.–Mexico boundary in this area.

The boundary between the United States and Mexico is defined by a natural waterway that runs along a large portion of Texas. The Rio Grande flows from southern Colorado down to the Gulf of Mexico, forming the border between Texas and northern Mexico for much of its course. This long, shared boundary is reinforced by historical treaties, which used the river as the dividing line in significant stretches. Other rivers listed do not run as the main border between the two nations across this region: the Colorado River doesn’t define the Texas–Mexico boundary, the Mississippi is well inland, and the Bravo River isn’t the boundary in question. So, the Rio Grande is the river that marks the U.S.–Mexico boundary in this area.