The Kingdom of Axum was located in present - day Eritrea and Ethiopia. It existed from 100 AD to 940 AD. It was the first state south of Sahara to mint its own coins. The main reason for the decline of the Kingdom of Axum was climate change. That change resulted a wave of soil erosion that attained catastrophic proportions after 700 AD. It became difficult for farmers to produce enough food for the population. Answer: One of the main reasons for the decline of the Kingdom of Axum was climate change.
