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The planet Pluto was discovered.
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the first clinical use of Penicillin
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The "Star Spangled Banner" became our national anthem.
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On May 1st 1931, the world's tallest building, the Empire State Building, was opened by President Hoover in New York.
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The television was in its infancy
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President Roosevelt was elected.
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The United States pulls its troops from Haiti.
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Central Nebraska had experienced more than 20 days with temperature over 100 degrees.
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Hitler becomes Germany's Fuhrer.
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The Social Security Act set up a program to ensure an income for the elderly
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President Roosevelt was re-elected.
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The German Hindenburg air ship burned to the ground in less than two minutes by a spark the size of an ant.
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The major painting of the decade was titled "Guernica" by Pablo Picasso
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The famous American women pilot, Amelia Earhart, disappeared on a flight around the world.
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The Wizard of Oz made it's screen debut.