Some northern states have two dates because The first date represents the year in which the gradual abolition act was passed. The second date indicates when the last slave died or was freed.
Which state ended slavery first?
In 1780, Pennsylvania became the first state to abolish the slavery when it adopted a statute that provided for freedom of every slave born after its enactment ( once that individual reached the age of majority ).
Which Northern states had slaves?
Slavery was a dominant feature of the antebellum south, but it was also pervasive in the pre-civil war North--the new england states of maine, Vermont, New Hamsphere, Masachusetts, Connecticut and Rhode island all have history of Slavery.
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