Because slave-labour was the mainstay of the Southern economy, in which they gained their livelihood.
In the war, the poor white trash were not actually fighting for slavery, any more than most Union soldiers were fighting against it.
The average Confederate soldier was wanting to defend his homeland, and was also the sort of person who would be looking forward to a darned good fight.
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slaves were farmers.
Slavery in the southern states was supported by plantation owners who made their money off of crops. They believed that slaves were necessary to keep the southern economy going, so slaveholders were not willing to let their slaves go.
The northern states began working to end slavery, but the southern states needed slaves because they thought their economy would suffer without them.
Yes there were slaves Yes there were slaves
The Southern colonies were the ones with the big plantations, where they needed lots of people to work the fields. And slaves were the cheapest labor force available. New York and New Jersey didn't have as much large-scale farming, so not as much use for slaves.