Which American Invention Was First Demonstrated At The 1893 World's Columbian Exposition In Chicago?

Which American Invention Was First Demonstrated At The 1893 World's Columbian Exposition In Chicago?
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Did You Know!

The term T-shirt first appeared in a novel in 1920.

F. Scott Fitzgerald was the first known person to use the term T-shirt when he included it in his novel, This Side of Paradise.