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Collapse of Mayan civilization likely due to drought, samples from Belize's Blue Hole reveal

Solar maximum to Minimum cycle
Regardless of how advanced our modern culture may seem, we are still as dependent on water as ever to survive. And water supplies are dwindling worldwide, partly due to severe droughts.

It is also theorized that droughts led to the demise of the Assyrian civilization during the 7th century B.C., the Mayans abandoned their cities roughly 800 A.D. to 1100 A.D. and the Lao Ancient civilisation who lived at Plain of Jar had also disappeared and history will repeat if not prepared.