Page "DC Universe" Paragraph 1

The concept of a shared universe was originally pioneered by DC Comics ( originally known as National Periodical Publications ) and in particular by writer Gardner Fox.

The fact that DC Comics characters coexisted in the same world was first established in All Star Comics # 3 ( 1940 ) where several superheroes ( who starred in separate stories in the series up to that point ) met each other in a group dubbed the Justice Society of America, with a request to reintroduce the Justice Society the Justice League of America was then founded with Major League Baseball's National League and American League as inspiration for the name.

The comic book that introduced the Justice League was titled The Brave and the Bold However, the majority of National / DC's publications continued to be written with little regard of maintaining continuity with each other for the first few decades.