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Captain America Comics #1, containing the first appearance of the superhero Captain America, is published.

Related Wikipedia articles
Captain America Comics
Comic book series (1941–1949, 1954)
Captain America Comics is a comic book series featuring the superhero character Captain America. The series was originally published by Timely Comics from 1941 to 1950, with a brief revival by Atlas Comics in 1954.Source: Wikipedia (CC BY-SA)
Captain America
Marvel Comics superhero
Captain America is a superhero created by Joe Simon and Jack Kirby who appears in American comic books published by Marvel Comics. The character first appeared in Captain America Comics #1, published on December 20, 1940, by Timely Comics, a corporate predecessor to Marvel.…Source: Wikipedia (CC BY-SA)
December 20
Day of the year
December 20 is the 354th day of the year in the Gregorian calendar; 11 days remain until the end of the year.Source: Wikipedia (CC BY-SA)