Slavery came to the colonies in 1609, so it has been here since the start.
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Vermont was the first territory (not a state at the time) to abolish slavery in 1777, the first state to abolish slavery outright was Pennsylvania in 1780.
Slavery was banned in the Northwest Territory in 1787.
Kansas
Vermont was the first territory in 1777 to abolish slavery but in 1780 Pennsylvania was the first state to enact a law beginning abolition of slavery, freeing future children of slaves. Massachusetts was the first state to abolish slavery outright in 1783.
In 1787, Congress banned slavery in the new northwest territory. The territory included the states of Ohio, Indiana, Illinois, Michigan and Wisconsin. By prohibiting slavery in the territory, it made the Ohio River the boundary between slave and non-slave states.