The historians cited in the article all agree with one another about the cause of the Civil War. Despite coming from different backgrounds and cultures, the historians agree that slavery was the root cause of the Civil War. The fact that all these historians generally agree with one another makes their shared viewpoints more reliable and valid, especially because the historians have different backgrounds and all work for the well-respected institutions of Howard University, Clemson University, and the University of Colorado.
In the United States, both the President and the State Department are responsible for foreign policy, although most of these powers are delegated to the Secretary of States.
I say C. because the entire paragraph is talking about political power.
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I'm not sure, but one may be using a sickle to cut plants/grass.
