The state of Vermont became the first to abolish adult slavery after declaring the Constitution of Vermont.
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A flying saucer crash at Roswell, New Mexico, was broadcasted to the public.
Navigator Vasco da Gama of Portugal started his first voyage.
The first public reading of the Declaration of Independence occurred.
The US Federal Trademark Act began, which allowed authorization of Trademarks.
The Solar Challenger became the first solar-powered airplane to cross the English Channel.
