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The Supreme Court unanimously denied to challenge the 19th amendment, which gave women the right to vote.
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The purge known as the Night of the Long Knives began in Nazi Germany. Hitler ordered the assassination of approximately 100 people he believed were liable to act against him.
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The Bataan Death March began in which 60,000–80,000 Filipino and American prisoners of war were forcibly marched 97 miles to Camp O'Donnell.
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Bombing of Mandalay: The Burmese capital of Mandalay suffered a devastating air raid when the Japanese dropped incendiary bombs that created a firestorm killing about 2,000 civilians.
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Flooding of the Mississippi River left 23 dead and an estimated 22,000 homeless.
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Puerto Rico approves its 1st self-written constitution
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The 23rd Vuelta a España (Tour of Spain) bicycle race began. It would be won by Felice Gimondi on May 12 after he was the leader at the completion of the 18 stages of the 3,014 kilometres (1,873 mi) race.
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Riverfront Stadium in Cincinnati opens.
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The U.S. ends its trade embargo of China.
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USSR performs nuclear test at Eastern Kazakh/Semipalitinsk USSR
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Lisa Clayton completes her 10-month solo circumnavigation from the Northern Hemisphere.
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Austral Airlines DC-9-32 crashes and explodes near Nuevo Berlin, Uruguay, killing 74
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Tomb of a 700 year old female mummy, discovered by road workers, opened in Taizhou, Jiangsu, China