The answer is Kush overused its natural resources and did nothing to replace them.
What was the kingdom of Kush known for?
In battle, Kush was famous for its archers and the bow and arrow were often depicted in the art of Ancient Kush. Sometimes the region was called the "Land of the Bow" because of its famous archers. One of the most famous leaders of Kush was Piye who conquered Egypt and became pharaoh of Egypt.
Who ruled the kingdom of Kush?
By the 8th century BCE, the kings of Kush came from hereditary ruling families of Egyptianized Nubian chiefs who possessed neither political nor family ties with Egypt. Under one such king, Kashta, Kush acquired control of Upper (i.e., southern) Egypt, and under his son Piye (formerly known as Piankhi.
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