The kingdoms of Kush and Axum (Aksum) were located in Northeast Africa. Kush was south of Egypt from 2000-1000 BC and served as a trade corridor between Egypt and interior Africa. Axum emerged to the south of Kush in the 1st century AD near the Red Sea. It developed as a major trading hub due to its location between sea and caravan routes. Axum adopted Christianity in the 4th century AD and developed advanced farming techniques but declined after 750 AD due to Muslim invasions and environmental degradation.