Key dates in the chronology of abolitions 1777 Abolition of slavery in Vermont (USA). 1780 Progressive emancipation of slaves in Pennsylvania (USA). 1783 Progressive emancipation of slaves in Massachusetts and New Hampshire (USA). 1784 Progressive emancipation of slaves in Rhode Island and Connecticut (USA). August, 26 1789 Declaration of the Rights of Man and of … Continue reading Key dates in the chronology of abolitions