How did the discovery of iron affect the Kushiite economy?

The use of iron affected Kushiite   by allowing them to use iron to make   plows instead of making them out of copper or stone. With better tools, they were able to grow more grain and other crops. the warriors also created iron weapons, which boosted their military strength.

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i think it was because of how protected egyptian civilization was was which allowed them to evolve without much outside influence.