Why were sub-saharan africa tribes or ethnic groups somewhat isolated?

in 550 b.c.e. cyrus the great, the leader of the persians, conquered the medes and united the iranian people under one ruler for the first time. cyrus became the first king of the persian empire and went on to establish one of the largest empires in world.

- "friedan's attitude towards what she calls the 'feminine mystique' is that she sees the ideal of femininity as stiffing women's potential in the 1950's. betty friedan was a writer and activist of the 1950's and 60's."

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it granted civil rights to african americans.