Answer: [SAMPLE ANSWER] Sheep played an important role in the Texas economy especially after the Civil War, when demand for wool was high. Sheep ranchers would often compete with cattle ranchers over grazing land and disputes would sometimes occur. Horses also played an important role in the cattle industry as they were used to herd and drive cattle before the railroad went through Texas. Mustangers, who caught and tamed horses, contributed to the success of the cattle industry.