What are deserts often sparsely pupulated

Some of the factors which satisfy the fact behind the sparse population in a desert: No water is available and hence people could get dehydrated. the land is not fertile to grow crops, which means no agriculture and no food. The hot desert climate makes you catch heat strokes

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nothing certain is known about what happened, but it seems that the country declined gradually, perhaps due to bad government, or, more likely, due to a series of bad harvests, which resulted in widespread and recurrent famine.

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