Oklahoma became the 46th state to join the United States of America.
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The fourth largest diamond was found in Karowe Mine, Botswana.
Rapper Dr. Dre released his second album, 'The Chronic 2001.'
Spanish conquistadors captured Atahualpa, the last Inca emperor.
Call of Duty: Black Ops 2 earned a staggering $500 million within 24 hours of release.
The Model M Postage Meter was put into commercial use.
