Use reasoning to lead to the answer of the following question:
Old cowboy and indians movies always have a horse, they also usually take place in what region?
Options:
- canada
- triple crown
- england
- american southwest
- kentucky derby
 Reasoning process:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
American Southwest is a region of the western united states. Prior to the arrival of Europeans, the southwestern united states were inhabited by very large population of American Indian tribes. Due to ancient culture Old cowboy and Indians movies always have a horse in American southwest. Therefore, the final answer is american southwest.