Answer:
Explanation:
The idea that O'Sullivan describes in this quotation is A) manifest destiny. Manifest Destiny was an idea that O'Sullivan was responsible for popularizing in the 1800s. This political theory or ideology sought for the United States to expand its borders to the Pacific Coast based upon a god given right to expansion which he called Manifest Destiny.
Answer:
To study ancient books.
Explanation:
By studying books that was written at that time is the only way the historian takes help and study the past because there is no other tools except the writings which helps the historian in order find out the daily life of ancient peoples. There are some people are present in every era who saved the specific characteristics of that time in the form of writing books in order to transfer the information to coming generations.
