Here's a review from wikipedia:
Nineteen Eighty-Four is set in Oceania, one of three inter-continental super-states that divided the world among themselves after a global war. Most of the action takes place in London, the "chief city of Airstrip One", the Oceanic province that "had once been called England or Britain". Posters of the Party leader, Big Brother, bearing the caption "BIG BROTHER IS WATCHING YOU", dominate the city, while the ubiquitous telescreen (transceiving television set) monitors the private and public lives of the populace. The social class system of Oceania is threefold:
- (I) the upper-class Inner Party, the elite ruling minority
- (II) the middle-class Outer Party, and
- (III) the lower-class Proles (from proletariat), who make up 85% of the population and represent the uneducated working class.
- the Ministry of Peace (Minipax), which deals with war,
- the Ministry of Plenty (Miniplenty), which deals with economic affairs (rationing and starvation),
- the Ministry of Love (Miniluv), which deals with law and order (torture),
- the Ministry of Truth (Minitrue), which deals with propaganda (news, entertainment, education and art)
The story of Winston Smith begins on 4 April 1984: "It was a bright cold day in April, and the clocks were striking thirteen"; yet he is uncertain of the true date, given the régime’s continual rewriting and manipulation of history. His memories and his reading of the proscribed book, The Theory and Practice of Oligarchical Collectivism, by Emmanuel Goldstein, reveal that after the Second World War, the United Kingdom fell to civil war and then was absorbed into Oceania. Simultaneously, the USSR conquered mainland Europe and established the second superstate of Eurasia. The third superstate, Eastasia, comprises the regions of East Asia and Southeast Asia. The three superstates wage perpetual war for the remaining unconquered lands of the world, forming and breaking alliances as is convenient. From his childhood (1949–53), Winston remembers the Atomic Wars fought in Europe, western Russia, and North America. It is unclear to him what occurred first: the Party's victory in the civil war, the US annexation of the British Empire, or the war in which Colchester was bombed. However, his strengthening memories and the story of his family's dissolution suggest that the atomic bombings occurred first (the Smiths took refuge in a tube station), followed by civil war featuring "confused street fighting in London itself", and the societal postwar reorganisation, which the Party retrospectively calls "the Revolution".