Which primary source document could a historian understand why the us civil war started?

a map of the 1860 presidential election results

a map showing where the first battles occurred

a charleston mercury editorial published in 1860

I think the correct answer from the choices listed above is the third option. The primary source document that could help a historian understand why the US Civil War started is a Charleston Mercury editorial published in 1860 because it contains factual accounts of the events during that time. Hope this answers the question.

Possibly.

Explanation: