Wow, I had no idea the 1940s were so extreme...
Actually I don't think it's set in the 40's exclusively.I'm guessing that the teased images and the fact that Huntress and Power Girl are from Earth-2 but end up in the main DCU and the image showed Helena as Earth-2 Robin and PG as Supergirl makes me believe that these are the children/grandchildren of the GA JSA from Earth-2. Pure speculation on my part but that's what I'm going with.
GA=Golden Age
