well, the concept is called the Great Multiverse which a series I plan to do that involves multiple universes involved in a massive multi-dimensional war call the Great Multiverse War, but was then refereed to as the First Multiverse War which the Second came to be. The First Multiverse War largely involved three factions, the Alliance of Nations, Axis of Empires and Coalition of Independent States, but it also had a large amount of independent factions fighting all sides as well and ended in Alliance. the Second Multiverse War involved four factions, two of which were factions that was in the Alliance of Nations, by then the Alliance of Civilizations, and one was kick out of the war halfway though it, these factions are the previously mentioned Alliance of Civilizations, Alliance of Imperial Powers, Pact of Revolutionary Civilizations and the Coalition of Independent States, also ended in Alliance victory. then came the chaotic Infection War, which really wasn't a war, more of a massive series of outbreaks that devested everyone involved and the United Civilizations, the Alliance once again renamed, only managing to crave out a Pyrrhic victory, but out of the ashes of this, came the Multiversial Federation, but it did not see the end of conflicts, not one bit, it saw, a number of wars and conflicts before the series end with the Multiverse Civil War, a full 8600+ years sense the start of the series as a whole