Which primary source document could help 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 /an essay that lists several possible causes

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The right answer for the question that is being asked and shown above is that: "occurred a Charleston Mercury editorial published in 1860 " The primary source document could help a historian understand why the US Civil War started is that occurred a Charleston Mercury editorial published in 1860 

Answer:

a Charleston  Mercury editorial published in 1860

Explanation:

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