What African civilizations benefited from the Nile River?

Egypt grew wealthy from the gold found in Nile River sediment What did the Nubians receive from African countries, other than Egypt, when they  Other civilizations also benefited from the knowledge of the Egyptians.

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martin luther king (1929-1968) was an activist for the african american rights, mr. king has a profile of a kind leader that built a tenacity, respect and full of hope future. he was an activist through civil disobedience and no violence pressure mechanisms. he tried to build a more egalitarian and fair society. his efforts carried a reivindication message of the civilian rights to every west corners. for that reason, he won the nobel prize in 1964.