American inventor Eli Whitney was granted a patent for a ground-breaking new type of cotton gin.
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President Warren G. Harding became the first president to pay taxes in the US.
The first theater with a movie being projected from the back of the room was opened in New York City.
Anne Miller became the first American patient to be treated with penicillin.
German inventor Ferdinand von Zeppelin granted a patent for the navigable balloon.
Beyoncé won her 28th Grammy Award, breaking the world record for most Grammys won by an artist.
