In what ways are the animals of animal farm building a new society?

Most of the animals who were alive during the Rebellion are dead. The farm is now prosperous. Other animals have been bought to replace the dead ones. The windmill has been finished, but instead of generating electricity to help all the animals, it is used for milling corn to make money for the pigs. Napoleon tells the animals that the truest happiness "lay in working hard and living frugally." And they do that