One important advantage that primary soruces have over secondary sources is that primary sources offer a firsthand account of an event - b, which isn't the case with secondary sources. Although this leaves primary sources prone to being biased compared to secondary sources.
I think it's David G. Farragut, I just researched.
Cultural exchange and the change in global population are the immediate consequences of the columbian exchange. Proliferation of invasive species and some communicable diseases are the most important byproducts of the columbian exchange.
I believe in him also, but since has been trying to prove his existence for a while now
The answer would be C, different economics, because the northern states were going through an economic boom, due to industrialization. The southern states were running on slave labor.
