This video is really good to watch if you are studying about American Revolution.
The colonies have to choose between being united and gain liberty, or death. Even though the colonies wanted to have liberty, they did not give what they wanted to the slaves. Slavery happened mostly in Williamsburg. Even though some slaves fought in the war and helped the colonies, the slaves didn't gain their own liberty until many years later...
Click this link for The American Revolution Timeline: http://www.timetoast.com/timelines/the-american-revolution-timeline--24