Why do many historians consider economic differences the main cause of the Civil War?

Historically, textbooks have taught that incompatibility between northern and southern economies caused the Civil War. Southerners made huge profits from cotton and slaves and fought a war to maintain them. ... Northerners did not need slaves for their economy and fought a war to free them.

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in 1897, pershing became a tactical officer at west point, and that's where he was given the nickname "black jack." pershing's first name is "john," for which "jack" is a nickname, and he was a white man who commanded black troops. hence "black jack".

the democratic and republican parties

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