Which of the following sentences requires citation?
A. At our school, we only learned about a fraction of the political and economic complexities of the American Civil War.
B. I would wager that most students in the United States will be able to tell you that the Battle of Fort Sumter in 1861 started the American Civil War.
C. There were buffalo in every western territory of the United States as of 1860.
D. They say that history is written by the victors.
The sentence " There were buffalo in every western territory of the United States as of 1860." requires citation because it presents a claim or fact that is not common knowledge and needs to be supported by a source
Therefore, the Correct Answer is C.