Thread:Netministrator/@comment-1038387-20131220152611/@comment-1038387-20131227110440

Earth-One and Earth-Two did not exist anymore at the time. So that issue is completely irrelevant in this discussion.

Their pre-Crisis events of the CC were never identified with any particular Earth; however, it was published during the (late) Silver Age, and so it's defaulted as Earth-One. World War II happened on Earth-One, and not all WWII stories were placed on Earth-Two.