An Act for the Gradual Abolition of Slavery
The Act prohibited further importation of slaves into the state, required Pennsylvania slaveholders to annually register their slaves (with forfeiture for noncompliance, and manumission for the enslaved), and established that all children born in Pennsylvania were free persons regardless of the condition or race of their parents.
Those enslaved in Pennsylvania before the 1780 law went into effect remained enslaved for life. Another act of the Pennsylvania legislature freed them in 1847.
Pennsylvania's "gradual abolition" — rather than Massachusetts's 1783 "instant abolition" — became a model for freeing slaves in other Northern states.
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The 1780 Act prohibited further importation of slaves into Pennsylvania, but it also respected the property rights of PA slaveholders by not freeing slaves already held in the state. It changed the legal status of future children born to enslaved PA mothers from "slave" to "indentured servant," but required those children to work for the mother's master until age 28. To verify that no additional slaves were imported, the Act created a registry of all slaves in the state. Slaveholders who failed to register their slaves annually, or who did it improperly, lost their slaves to manumission.[2]
The 1780 Act specifically exempted members of the U.S. Congress and their personal slaves. Congress was then the only branch of the federal government under the Articles of Confederation, and met in Philadelphia.
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Those enslaved in Pennsylvania before its 1780 Act became law continued to be lifelong slaves, unless manumitted. Also, the 1780 Act and its 1788 Amendment did not apply to fugitive slaves from other states or their children. Pennsylvania tried to extend rights to fugitive slaves through an 1826 personal liberty law, but it and the 1788 Amendment were ruled unconstitutional by the U.S. Supreme Court in Prigg v. Pennsylvania (1842).
Although slavery steadily declined in Pennsylvania, the state that had initially led the way toward abolition tolerated it for decades after it ended in New England. The 1840 U.S. Census listed 47,854 (99.87%) of the state's Blacks as free, and 64 (0.13%) as enslaved.[10] Legal slavery ended in Pennsylvania in 1847, when the several-dozen remaining slaves (the youngest, aged 67) were freed.
http://en.m.wikipedia.org/wiki/An_Act_for_...

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