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In page Abolitionism in the United States:
"All of the other states north of Maryland began gradual abolition of slavery between 1781 and 1804, based on the Pennsylvania model and by 1804, all the Northern states had passed laws to gradually or immediately abolish it.[8][a] Some slaves continued in involuntary, unpaid "indentured servitude" for two more decades, and others were moved south and sold to new owners in slave states.[citation needed]
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