Since my great-great-grandfather died fighting against slavery in the Civil War, where do they send my check??
Ending slavery was not a goal of the war until nearly two years after it started. Even then, it was only for those areas still in "rebellion." Areas under Union control could still have slavery.
When the Northern states launched their invasion of the Southern states, they intended to leave slavery completely intact. Their only goal was to stop the Southern states from becoming independent of Washington DC, and nothing else.