the conflict began after Athens and Eritrea gave assistance to tue lonians in their rebellion against Persia and it ruler, Daruis. Although Darius was able to secure the loyalty of many Greek city-states, both Sparta and Athens executed his ambassadors rather than give up independence.
The important skill that gave Africa's Bantu speaking people an advantage would be "ironworking" This allowed them to successfully create things the Nomadic hunters couldn't.