http://en.wikipedia.org/wiki/File:US_SlaveFree1789.gif
These are the things I find wrong with it...
1. Maine was not a State
2. Vermont was not a State
3. Pennslyvania, Connecticut, New Hampshire and Rhode Island all had slaves listed on the 1790 and 1800 census.
4. Officially the State of Georgie did not extend into what would become the Mississippi Territory, this area was still governed by Spain at Natchez, Georgia had no means to administer or control what it claimed and the Spanish Army was there to prove it. Later the area was organized into a U.S. Territory, its ordinance forbide the importation of slaves into it, and any such slave or slaves discovered would be freed (act of 1798).
When the Constitution was ratified in 1788 there were 12 slave states.
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David Upton