Russian troops were poorly equipped and suffered more casualties than any other country
Answer:
D. Portuguese
Explanation:
The Portuguese formed alliances with Kongo leaders in the 1400s and 1500s.
The Kongo had been unstable with factional and regional conflicts and accepted an alliance with the Portuguese so they could restore order.
The Kongo leaders gave the Portuguese some colonies, allowing them to trade and have access to the Kongo slave labor.
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.
