Finland declared war on the Soviet Union after an air raid was launched on Finnish cities.
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Barbed wire was patented by Lucien B Smith in Ohio, US.
The World Health Organization estimated that Yemen had over 200,000 cases of cholera.
This day marked the end of Edward V of England's reign.
Florida, one of the confederate states, was readmitted to the Union.
North Korea sent 75,000 soldiers to invade South Korea, which would start the Korean War.
