Barbed wire was patented by Lucien B Smith in Ohio, US.
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Finland declared war on the Soviet Union after an air raid was launched on Finnish cities.
The Diary of a Young Girl by Anne Frank was published.
Former police officer Derek Chauvin was sentenced to 22.5 years in prison for the murder of George Floyd.
Virginia became the 10th state to join the United States of America.
North Korea sent 75,000 soldiers to invade South Korea, which would start the Korean War.
