An ancient Mexican city once home to 90,000 people vanished nearly 1,000 years ago. Scientists think a 650-year drought may explain why

Around a thousand years ago, the ancient city of Cantona stood as one of the largest urban centres in the Americas, with an estimated population of 90,000 people. Built on the volcanic highlands of central Mexico, the fortified settlement thrived for centuries before it was mysteriously abandoned by the mid-11th century.

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