But the revenue from Angola's black gold won't last forever.

CNN: Oil-rich Angola bids to secure future with $5bn wealth fund

American TV mogul Oprah Winfrey and newcomer Isabel dos Santos of Angola are the only black female billionaires on the FORBES billionaires list.

FORBES: The Black Billionaires 2013

When they are done with school, many young black males end up at Angola Prison, a correctional facility located on a former plantation where inmates still perform manual farm labor, and where 90 percent of them eventually die.

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