I'll give you a question, please answer with step-by-step reasoning process. Old cowboy and indians movies always have a horse, they also usually take place in what region?\nOptions:\n- canada\n- triple crown\n- england\n- american southwest\n- kentucky derby

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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.
The answer: american southwest.
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