Final answer:
The Coahuiltecan in southern Texas became hunters-gatherers, a lifestyle choice that was suited to the arid climate of the region.
Step-by-step explanation:
The climate of southern Texas influenced the Coahuiltecan to become hunters-gatherers to support themselves. Considering the arid and less green climate of the region, the Coahuiltecan adopted a lifestyle suited to the environment.
The evidence from various locations in the Southwest and Mesoamerica points toward a nomadic lifestyle for such groups, relying heavily on hunting and gathering due to the inconsistency of the climate for agriculture, unlike the more sedentary and agriculturally focused societies further north and in Mesoamerica where maize was widely cultivated.