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Which president before Lincoln abolished slavery in the northern United States?
1780, Massachusetts and Pennsylvania abolished slavery.

1784, Rhode Island, Connecticut, Abolish Slavery.

Slavery was abolished in New Hampshire.

1793, Vermont abolished slavery.

All the above were abolished during George Washington's administration.

1799, new york, abolition of slavery, then President john adams.

1804, New Jersey, abolished slavery, then President Thomas Jefferson.