I think that one of the most profound changes that the years have brought to the farm is the consolidation of Napoleon's power. If one recalls the first chapter and the commandments laid down by Old Major in terms of animals being distinctive from humans, the years have shown a complete abdication of these ideals. Napoleon has become the unquestioned force of power and the source of authority on the farm. The pups that he took to rear for his own have become his own secret police, shown to be cruelly and brutally destructive in chapter 7. Napoleon's brokered deals with the humans from other farms as well as his eating dinner alone and representing the origin of all control and authority have created a situation where no other animal can pose a successful alternative to his power nor can remember any other power other than Napoleon. History has been rewritten to an extent and the present and future continue to be written so that Napoleon represents power in the most dominant of forms. The fact that the animals peering from the outside cannot see any difference between the animals and the humans indicates this.