The ancient Sonoran Desert People lived and thrived in Arizona for more than a thousand years. The Casa Grande was a massive undertaking for this advanced society, and it’s believed that the structures were completed around 1300. But by 1450 it had been abandoned, and no one is sure exactly why.

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Have you visited Casa Grande National Monument? Tell us about your visit!

If you’re interested in Arizona’s history, take a look at these 7 horrifying Arizona stories you didn’t learn about in history class.

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