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.
The city of Havana, Cuba, celebrated its 500th birthday.
Spanish conquistadors captured Atahualpa, the last Inca emperor.
The Skylab 4 mission was launched by NASA, taking a crew of three astronauts to the US space station.
Rapper Dr. Dre released his second album, 'The Chronic 2001.'
