The ~War of Northern Aggression~ is still being fought. It is now fought in Courts, Congress and Bureaucracy with the continued growth of the Federal Government to the shrinking of states` and individual rights. 
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Slavery just happened to be the point of contention at the time. 
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Now, it is a variety of issues including control of education, control of business, control of speech, control of the right to bear arms, etc. The war was and is a battle of cultures. 
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The ~ Faith , Freedom and Responsibility ~ culture against the ~Atheistic Big Brother~ culture is where the battle lines are drawn today.