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Hey, I don't know much, but I THINK! That it was most of the Southern States, by which the North said it was Un-Human to treat people like slaves, which lead to (America-vs-America) (US-vs-US) Civil War...
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Go to google and type in "slave holding states USA" this will tell you which states held slaves right before the Civil War, or at least identified as "slave holding states". However, I am pretty sure that there were many Northern states who had slaveholders-- just in smaller numbers. http://www.slavenorth.com/
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wats up fools