What was not a problem for the early river valley civilizations

The early civilizations of the river valley had no problems with food. This is because the river provided irrigation for their crops, as well as fish for food.

Explanation:

As we know, agricultural crops are the basis of our food, as human beings. Agriculture had the same importance in the most primitive civilizations, which were, in general, dependent on the planting of agricultural crops for their existence.

Unfortunately, many primitive societies struggled to establish their crops due to a lack of essential resources for plant growth, such as nutrient-poor or infertile soils and a lack of necessary irrigation. This was not a problem for the early civilizations of the river valley, because the river provided the irrigation that the crops needed to become productive, in addition to providing fish for food.