What is the history of the growth of the communities and trade along the Nile River?

It came about when they didn't use money so they used a method called bartering.

Nubians carried goods from central Africa and Nubia into Egypt and southwestern. They developed trade routes over land, and they boosted the affiliation between Nubia and Egypt.

The trade along the Nile river came from them using boats and other crafts to trade with other parts of Egypt along the Nile river.