While you didn't really provide the "following" as the comment above me states, in general, the advantage of secondary sources of primary ones is that they perhaps provide a more objective or even just a broader view on a certain topic. While a primary source of the American civil war would be a letter written by a soldier, a secondary source would be a book that describes more letters taken together and discusses possible information regarding them.
In my own opinion, regarding my readings in some credible source, the reason why the best-known preacher of the second great awakening <span>Charles Grandison Finney supported the temperance and abolitionist movement is that it is God's will to save the people and this movement thought that the salvation is possible on the good works.</span>
