Justice Society of America
Quick Summary
The Justice Society of America (JSA) was the first superhero team in comic book history, debuting in the winter of 1940. This team brought together DC Comics' heroes like the Flash, Green Lantern, Hawkman, and others to fight crime.1
The JSA was a precursor to the Justice League of America, which was formed in 1960 by combining many of DC's major superheroes. The concept of parallel worlds, such as "Earth-Two" where the Golden Age heroes like those in the JSA operated, became common, leading to annual crossovers between the Justice Society and the Justice League.2
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