Answer: About the history of the people who have lived in Pantagonia.
Explanation: The passage never brings anything up about the nomadic lifestyle, languages, or harsh environment. Don’t get tricked thinking that it is about the harsh environment because of all the talk of nature and environmental features. Because of process of elimination we now know it is about the people who have lived there.
The answer to the question you presented above would be 'persuasive speech' or 'oral persuasion'. These are the terms that refer to a speaker's use of persuasive language to persuade an audience.