What literary works ,historical events or movements might have influenced this writer?

Animal Farm was published on the heels of World War II, in England in 1945 and in the United States in 1946. George Orwell wrote the book during the war as a cautionary fable in order to expose the seriousness of the dangers posed by Stalinism and totalitarian government. Orwell faced several obstacles in getting the novel published. First, he was putting forward an anti-Stalin book during a time when Western support for the Soviet Union was still high due to its support in Allied victories against Germany. Second, Orwell was not yet the literary star he would quickly become. For those reasons, Animal Farm appeared only at the war’s end, during the same month that the United States dropped atomic bombs on Hiroshima and Nagasaki. The tragically violent events of the war set the stage well for Orwell’s fictional manifesto against totalitarianism.