The Timeline of the Book Chains By kitkat202 Apr 19, 1775 Beginning of Revolutionary War Nov 7, 1775 Male slaves were to be freed if they volenteered to work for the British Army Jul 8, 1777 After the Revolution, other states in the North gradually required slave owners to free their slaves. Sep 3, 1783 End of the Revolutionary War Jul 4, 1827 A law said that all slaves in New York were to be freed