Nineteen Eighty-Four

The novel’s events take place in 1984 in London, which belongs to the Air Zone No. 1 (the former United Kingdom). In turn, it is a province of Oceania—the totalitarian state that occupies one third of the Earth, including Great Britain, South and North America, Australia, South Africa, and Oceania itself. This state fights with two totalitarian superpowers—Ostasia and Eurasia.

How does the author, who wrote his novel 40 years before this, see 1984? Where does the fantasy end, and what here might be similar to reality?