The farm is an allegory to the soviet union. The first example is in the first paragraph of the story and is talking about animals in the farms lives not remembering the times before "the rebellion" started but meant the people in the soviet union don't remember what it was like. The farm being enlargened refers to the oppressed russian people having to work for stalin.
b. What are the rhetorical components of this allegory?
The windmill and threshing machine and various buildings were rhetorical elements describing what its like in a communist country. The farm growing richer without making the animals richer is a good