Rhode Island was the first state to abolish slavery in 1774.
Followed by:
- Vermont in 1777
- Pennsylvania in 1780
- Massachusetts in 1781
- New Hampshire in 1783
- Connecticut in 1784
- New York in 1799
- New Jersey in 1804
These new states never allowed slavery within their borders:
- Maine
- Michigan
- Wisconsin
- Ohio
- Indiana
- Kansas
- Oregon
- California
- Illinois