Explain how the story has run full circle.Begin with the overthrow of Mr. Jones's farm, Manor Farm and end with the last scene which Pilkington proposed a toast.
To me, the way that this story has run full circle is that the pigs (and Napoleon in particular) have come to act in exactly the same way that they human beings did before the revolution.
At the beginning, the humans exploit the animals. They use the animals for their own benefit and they do not seem to care what the animals want. By the end of the story, Napoleon and the rest of the pigs act this way as well. For example, you can see how Napoleon treats Boxer. When Napoleon sells Boxer to the knackers, we can see him exploiting a fellow animal for his own good.
We see this change symbolically at the end of the story when Napoleon looks just like the human beings.
I agree. I would add that while Napoleon has turned into Mr. Jones and the pigs are now nearly "human," the rest of the farm is exactly what it was in Jones's day. Most of the animals who lived through and experienced the revolution are now gone. The younger animals have no sense that life could or should be any different than is it right now. They have no clue, really, that on other farms pigs do not run things--nor would they care very much, if at all, if they did know this. The animals live the life they know, and they are content because they know no better--and Napoleon and the pigs are counting on this complacency and ignorance to keep them in power.