Compare how both of the documents make use of cannibalism in their writing. What is its significance and what does it metaphorically mean. Please...

Compare how both of the documents make use of cannibalism in their writing. What is its significance and what does it metaphorically mean. Please explain in details. 

http://americainclass.org/wp-content/uploads/2011/04/Fitzhugh-excerpt.pdf

http://teachingamericanhistory.org/library/document/address-to-the-colonization-society/