Question

Because the Rio Grande Valley had poor soil quality compared to other regions of Texas, Coahuiltecans

Answer 1

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Because the Rio Grande Valley had poor soil quality compared to other regions of Texas, Coahuiltecans "were non-agricultural and traveled in bands to follow game."

Early Coahuiltecans lived in the region of southern Texas and the northeast part of México, modern-day states of Coahuila, Nuevo León, and Tamaulipas, México. As the soil had poor quality and was not fertile to grow crops, this tribe wandered around following animal herds to hunt them and feed their families. They hunted armadillos, rabbits, snakes, deer, and Bison.