Political geography of Nineteen Eighty-Four

In George Orwell's 1949 dystopian novel Nineteen Eighty-Four, the world is divided into three superstates: Oceania, Eurasia and Eastasia, who are all fighting each other in a perpetual war in a disputed area mostly located around the equator. All that Oceania's citizens know about the world is whatever the Party wants them to know, so how the world evolved into the three states is unknown; and it is also unknown to the reader whether they actually exist in the novel's reality, or whether they are a storyline invented by the Party to advance social control. The nations appear to have emerged from nuclear warfare and civil dissolution over 20 years between 1945 and 1965, in a post-war world where totalitarianism becomes the predominant form of ideology, through Neo-Bolshevism, English Socialism, and Obliteration of the Self.