NEED ASAP PLEASE HELP 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