The Civil War is seen as a watershed moment in American history. Northern victory in the war kept the United States united and put an end to the slave trade, which had divided the country since its creation.
Over the course of a century, the people and politicians of the Northern and Southern states had contended over the issues that eventually led to war: economic interests, cultural values.
The federal government's ability to regulate the states, and, most importantly, the position of slavery in American society.
Thus, OptIon D is correct about civil war.
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