When the Multiverse Became a Universe

The presence of a 30th century Legion of Super-Heroes who never met nor knew of a Justice Society of America, and a parallel planet's 30th century that had to recruit the same Society to act as their own Legion to defeat invade Chameleons, highlights that there were two different outcomes to the Crisis on Infinite Earths. The one published over the past few decades was a composite Earth, however the one we will consider is the past, present and future of various Earths.

The point at which history diverged in undoubtedly the influence of Spectre at the alleged dawn of creation, when he interfered with the Anti-Monitor's scheme to bring about the birth of that which he would later consume. Had Spectre not had the power nor circumstances to do this at the last possible moment, the Multiverse would have continued and the Anti-Monitor would have been dispersed into his own realm once more.