Answer:
- to illustrate Japan's isolation in the 1800s.
Step-by-step explanation:
In the given excerpt, the author employs an outside source with an aim to demonstrate the segregation that Japan undergoes in the 19th century. The descriptions like 'closed off from the world,' 'opted out of the community of nations' gives a hint to the readers about Japan's isolation from the world while Stephen's tableau displaying 'self-sufficient and deserted nation' further substantiates the country's hidden and quiet existence. Thus, the outer source gives a clear view of Japan's remote situation during the early and mid-nineteenth century.