Using the map, which river is also an important political feature and why? A. The Rio Grande, because it acts as a natural border, separating Texas from Mexico. B. The Guadalupe River because the area along the river became the largest missionary center in Texas C. The Rio grande because it contains more riverfront communities than any other region in Texas D. The Guadalupe River, because the Texas Declaration of Independence was signed in a building facing the river

A. The Rio Grande, because it acts as a natural border, separating Texas from Mexico.

Explanation:

The Rio Grande is an important river which acts as a natural border separating Texas from Mexico. Rio Grande started in south-central Colorado in the United States and flows to the Gulf of Mexico. Due to this river, Mexico is located at one side while Texas is present on the other side of the river. This river helps in separating two regions naturally so we can conclude that Rio Grande act as natural border.

c. the dred scott v. sandford case,