CNN's Tom Foreman looks back at the history of North Korean threats and the resulting outcome of its brinkmanship.
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Researchers say President Barack Obama was a descendent of the first documented African slave in the U.S.
RELATED STORY: Obama's family tree connection to first African American slave
The Situation Room with Wolf Blitzer is the command center for breaking news, politics and extraordinary reports from around the world. Tune in weeknights from 5-7pm ET and Saturdays from 6-7pm ET on CNN.
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