Answer:
i think the answer is A :))))))))))))))))))))))))))))))))))))
6.) Bartolomé de las Casas
9.) Ecomienda?? Not sure on this one, though that wasn't for Native Americans.
10.) Cahokia!!
3.) Thomas Morton (Had to look this up. http://che.umbc.edu/londontown/docs/NativeAmericansintheChesapeake.pdf BOTTOM)
I don't know any other ones, hope I helped to a certain extent.
Answer: True
Explanation: Fredrick Douglas was an escaped slave and spoke against slavery which makes sense cause he tried to escape it
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.