Final answer:
The rivalry between Egypt and Nubia was fueled by trade and conflict, with Egypt seeking to control Nubia's resources and trade routes.
Step-by-step explanation:
The rivalry between Egypt and Nubia was primarily driven by trade and conflict. Egypt traded with Nubia for resources such as gold, ivory, and slaves, but also suffered from raids by Nubian kingdoms. Egypt sought to control Nubia's valuable trade routes and wealth, which led to military conquests and the establishment of Egyptian control over Nubia.