Orwell shows the incrimental rise of tyrrany among barnyard animals. That's really what is at the heart of this book: the slow methodical creep of ever more constrictive, exploitive, and oppressive laws which transform a free society to a totalitarian dictatorship. Each step is slowly introduced, and introduced to the public in a calm and well-reasoned manner. If done skillfully, no individual step will incite the public to stand up and oppose the overarching plan to enslave them. Joesph Stalin came to power around 1922-26, depending on the criterion applied, but it took him another 10 years to really cement together his ironclad dictatorship. So it is with Napolean the Pig, who becomes the barnyard leader with the slogan "All animals are created equal", and only later quietly adds "...but some animals are more equal than others." The book unfolds in baby steps, slowly constructing a regime no better (indeed far worse) than the one it replaced. Once he removes the Farmer, Napolean purges potential rivals (e.g. the popular and beloved horse), trains a private army of attack dogs answerable only to him, and starts to set himself apart in a seperate and superior class from the other animals by walking upright like the Farmer did.