Connecticut

 

Historical Timeline
 1783  Connecticut was admitted as a free state through constitutional interpretation.
 1790 By this time, in the original 7 free states, slavery has been or is gradually being outlawed: Pennsylvania, Massachusetts, Rhode Island, Connecticut, New York, New Hampshire, and New Jersey.
 1839 39 African captives led by Joseph Cinque rebel against their Cuban captors and order two surviving whites to sail the Amistad to Africa.  The ship is seized off the coast of Long Island and the Africans are jailed in Connecticut.