Research the original Declaration of Independence. There was a whole paragraph that phased out slavery that was removed.

Jefferson, though a brilliant idealist, was a failure as a man when it came to upholding those ideals. He kept his slaves way too long and compromised way too much when it came to ending slavery. The "civil war" should have taken place right after the Revolution. Of course then it would have been a free country liberating slave colonies so it would have been a legitimate conflict.