What was the historical setting of the world in 1946, the copyright date of Animal Farm? What effect did this have on Orwell's work?

1946 marked the end  of World War II, but Communist Russia
began asserting itself and began to dominate international politics. This resulted in
the beginning of the Cold War and Europe itself being divided into two camps - one
capitalist like West Germany, and the other communist like East
Germany.

Orwell, like many others, was totally
disillusioned by the consequences of the communist revolution in Russia in 1917. Instead
of an open - In March 1946 Churchill coined the phrase "the iron curtain - egalitarian
society, by 1946 the USSR had become a brutal dictatorship with no respect for human
rights.

His disillusionment is expressed bitterly in the
concluding lines of "Animal Farm" :

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No question, now, what had happened to the faces
of the pigs. The creatures outside looked from pig to man, and from man to pig, and from
pig to man again; but already it was impossible to say which was
which.