That would be Rhode Island.
Slavery in the US started in Jamestown in 1619 when the first Africans arrived as slaves.
England
The "First State " of the US is thought to be Delaware, because it was the first state that ratiied the new US Constitution. Delaware's state motto is "The First State."
Slavery was outlawed in the United States by the 13th Amendment, so anyone involved in its passage helped forbid slavery (including the Houses of Congress and the State Legislatures).
The issue of state's rights is still debated by historians and polititians today. The issue of slavery however is not a factor. Slavery was abolished in the US when the 13th Amendment to the US Constitution was adopted.
Northwest Ordinance of 1787
Northwest Ordinance of 1787
Northwest Ordinance of 1787.
Northwest Ordinance of 1787.
Maryland was the first US state to support slavery.
The US State of Vermont-colony was the first state to outlaw slavery. The date was 1777.
northwest ordinance
The 13th amendment
The Abolitionists.
the first signs of slavery was in Virginia
US
Slavery was first made illegal in the Northern states of the United States. The state of Vermont was the first to abolish slavery in its constitution in 1777, followed by Pennsylvania in 1780. By the early 1800s, Northern states had all gradually abolished slavery.