It was a global war for manny reasons
Answer:
To the north was Lower Egypt, where the Nile stretched out with its several branches to form the Nile Delta. To the south was Upper Egypt, stretching to Aswan. The terminology "Upper" and "Lower" derives from the flow of the Nile from the highlands of East Africa northwards to the Mediterranean Sea.
Most likely good soil or water sources making people want to stay and farm or animals that stay all year round and don't migrate another good source of food.
