What factor most likely led to the abandonment of Chaco Canyon in the twelfth century?

Name: What factor most likely led to the abandonment of Chaco Canyon in the twelfth century?
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Drought is the most likely factor that led to the abandonment of Chaco Canyon in the twelfth century, as archaeological evidence and climate records indicate prolonged dry periods that would have made agriculture and thus sustaining the population difficult.

What Factor Most Likely Led to the Abandonment of Chaco