>>94728057Earth-2 was originally the home for all stories DC published during their "golden age", so essentially everything in between
>Action Comics #1and Showcase #4. Earth-2 was first established as a distinct and separate world from Earth-1 in
>The Flash #125where Barry Allen met Jay Garrick for the first time. This led to a series of annual team ups between the Justice League and the Justice Society, most of which are collected in the
>Crisis on Multiple Earthsseries of trade paperbacks. The return of the golden age characters proved to be so popular that DC launched several ongoings set on Earth-2, such as the following:
>All-Star Squadron>Infinity Inc.Eventually, Earth-2 was absorbed into Earth-1 during
>Crisis on Infinite Earthsand stopped existing as a unique world until it was restored in
>Infinite Crisisand
>52This recreated Earth-2, essentially a copy of the original from before CoIE, was only really explored in one story,
>JSA Annual #1and proved to be short lived, as it was replaced by another completely different version as a result of the Flashpoint event. The new Earth-2 tried to modernize the golden age characters by distancing them from their World War 2 backgrounds. This new version of Earth-2 is, as far as we know, the version that still exists to this day. You can read about it in the following series:
>Earth 2>Earth 2: World's End>Earth 2: Society 
