What was one main difference between the northern and southern armies

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Explanation: One of the primary differences between the Northern and Southern economy before the American Civil War was the presence of slavery. Uncle Tom's Cabin focuses on this element, this difference between North and South. Part of the reason why slavery is shown to be so cruel is that it degrades human beings as objects.

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explanation:

i believe it would influence their own way of understanding things. it shall be a foundation where they can draw or start an argument.   historians are also  scientists that  have their tools of analysis and expertise to unlock a variety of difficulties such as relationships of man, origin, politics, economy, and culture. based on facts and understanding on these areas, they may shade light to extract ideas and develop options to validate a hypothesis or debunk it.