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.
Mexican Cession. Mexican Cession lands were captured in the Mexican–American War in 1846–48, and ceded by Mexico in the Treaty of Guadalupe Hidalgo, where Mexico agreed to the present Mexico–United States border except for the later Gadsden Purchase.
Answer:
#1 He had a degree in Western philosophy. #2 It was a kingdom ruled by philosopher kings. #3 Aristotle was wrong about basic human rights.
The correct answer is B) Ming artistic achiviments included rugs, temples, lacquered trays and blue porcelain. Ming China did use the civil service system so A) is incorrect. They moved the capital to Beijing, but nothing was renamed or rebuilt thus C) is incorrect. Also Zheng He was simply a Chinese explorer so D) is incorrect as well.