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Current opinion holds that the Ancestral Puebloans responded to pressure from Numic-speaking peoples moving onto the Colorado Plateau, as well as climate change that resulted in agricultural failures.
The archaeological record indicates that it was not unusual for ancient Pueblo peoples to adapt to climatic change by changing residences and locations.
Early Pueblo I Era sites may have housed up to 600 individuals in a few separate but closely spaced settlement clusters.
However, they were generally occupied for a mere 30 years or less.
Archaeologist Timothy A. Kohler excavated large Pueblo I sites near Dolores, Colorado, and discovered that they were established during periods of above-average rainfall.
This would allow crops to be grown without benefit of irrigation.
At the same time, nearby areas experiencing significantly drier patterns were abandoned.

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