Talk:Monster X/@comment-26155014-20150414122659/@comment-25285745-20150414160425

None of that is ever said. All that is known is that there was a period where kaiju were loose all over the world, but the EDF was formed and managed to drive them away for several decades. The only one they could not defeat was Godzilla, but they finally managed to bury him in Antarctica several years before the main events of the film.

The fact that Godzilla spared Anguirus, Rodan, and Caesar could be seen as implying that he was allies with them prior to the events of the film, aside from just being a nod to the fact that they were his allies in the Showa series and a way to preserve the suits. The exact specifics of what occurred during the 1950s and 60s in the Final Wars continuity are never revealed.