The Nile river was responsible for the success because the annual flood made the soil much more fertile.
Explanation:
Egyptian civilization was formed along the longest Nile river , the annual flood that happened on the Nile river , made the soil fertile and thus there was more production of crops. The Nile River also helped the Egyptians for trading purposes.
Most of the part of Egypt is desert but on the other hand the soil along the side of the Nile River was fertile.There was huge production of wheat in the Middle East through out the year. As a result the Egyptians became rich.