Louis XVI of France declared war on Great Britain during the American Revolution.
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Nazi forces moved on Britain for the first time after attacking shipping containers in the English Channel.
NASA launched Telstar 1, the world's first active communications satellite.
A chemical factory in Seveso, near Milan, Italy, exploded, covering surrounding areas in dioxin.
Wyoming became the 44th state to join the United States of America.
The Scopes Monkey Trial took place in Dayton, Tennessee.