Take off D; the North had won some battles up to that point. Rip off A; the South would never let go of slavery. Take off B, since the Union had some wins already. You can now clearly see where the answer is.
I think the navy was instrumental in the Roman conquest of the Mediterranean basin. The navy was also a key in defending against barbarian invasions.
Well the modern study of hsitory helps us not make the same mistakes as we did in earlier history.
Answer:
A line chart would most likely work the best, as they show the most relevant data at any specific time.
Explanation: