The leader who sought to develop egypt economically and militarily and make it the fountainhead of pan-arab nationalism during the 1950s was

Gamal Abdel Nasser

Gamal Nasser named himself Prime Minister of Egypt in 1954 and took over government after a series of complicated intrigues with Egypt's King Farouk. He then went on to labor diligently to develop Egypt economically and militarily and make it the fountainhead of pan-Arab nationalism

(d) rivers.

explanation:

civilizations developed around rivers because their waters provided places to hunt and fish. also, as the rivers flooded, the lands around them became fertile. this allowed them to support farming. this is especially true of the nile river, which flooded the same time each year.