Final answer:
Texas is the largest state in the Southwest region in terms of land area and population.
Step-by-step explanation:
In the Southwest region, Texas is the largest state, both in terms of land area and population. It spans over 268,000 square miles and has a population of over 29 million people. Arizona is the sixth largest state by land area and has a population of around 7 million. Oklahoma is the twentieth largest state by land area and has a population of around 4 million.
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