• DC's Golden Age heroes, including the Justice Society of America, whose careers began at the dawn of World War II (concurrently with their first appearances in comics): chemistry student Jay Garrick as the Flash; radio engineer Alan Scott as Green Lantern; archaeologist Carter Hall as Hawkman; and pint-sized powerhouse Al Pratt as the Atom
  • Politically, Earth-Two was distinctly different from the Earth-One template modeled after Earth-Prime. For example, Quebec was an independent nation autonomous from Canada, South Africa had abolished apartheid sooner, and the Atlantean countries of Poseidonis and Tritonis were ruled by a queen, not a king, their inhabitants displaying surface-dweller features and no capacity for underwater survival, as the Atlantis continent had been raised to the surface (the model was the Atlantis seen in Golden Age Wonder Woman stories).
  • First described as a distinct Earth in Flash (vol. 1) #123 (September 1961), first named in Justice League of America #21 (August 1963)

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