subsequently ratified a newer constitution in 1793. The Pennsylvania Gradual Abolition Act of 1780 made Pennsylvania the first state to abolish slavery by statute
Niagara, and Quebec, and the coal mines ofPennsylvania; also, the tour of New-England. 4th ed.. New York: J. & J. Harper. (1830). p. 117. https://archive
Revolution: From Dominion to Republic, 1776–1840. Lanham, MD: Lexington Books. ISBN 0-7391-2131-6 Hashaw, Tim (2007). The Birth of Black America. New York: Carroll