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No state abolished slavery during the Revolutionary War. Massachusetts via its Constitution of 1780 did not recognize slavery and thusly "abolished" it, but no state abolished slavery as far as I can see before or "around the time" of the Revolutionary War.
Massachusetts was the first U.S. state to abolish slavery, in a 1783 judicial interpretation of its 1780 constitution.
Texas
Because the High Court claimed that slavery could not be abolished in any state, as the Constitution gave it protection.
When speaking about the US Constitution, the term used to change this governing document is called an amendment. Since its original ratifications there have been numerous amendments added to it. Important ones abolished slavery and gave women the right to vote.
Vermont was the first state to abolish slavery.
Not slavery - slave-trading. It was the District of Columbia.
The Compromise of 1850 abolished slavery in the state of Washington DC. It also allowed California to become part of the union as a slave free state.
Missouri entered as a slave state. Slavery was abolished in Washington, D.C. The abolition of slavery in the district of Columbia
The state of New Mexico abolished slavery on December 6, 1865, when it ratified the 13th Amendment to the U.S. Constitution, which officially ended slavery in the United States.
Vermont was a territory that abolished slavery in 1777, but technically Pennsylvania was the first STATE to abolish slavery, doing so in 1780.
I think that it was abolished in oklahoma!