Final answer:
The Erythraean Sea served as a trade route connecting Aksum to other civilizations, enabling cultural exchange and economic growth.
Step-by-step explanation:
The purpose of the Erythraean Sea was to serve as a trade route connecting Aksum to other civilizations, allowing for cultural exchange and economic growth. Traded goods included gold, silver, iron tools, cotton cloth, tortoise shells, ivory, and spices such as frankincense and myrrh. This trade route played a crucial role in the power and prosperity of the Kingdom of Aksum in the fourth century CE.